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Harmanpreet

May 3, 2014

Want solution to this question.....

This answer has an image. Please click on the question to read more.

Answer (3)

Rita

Feb 8, 2015

Find the area of a circle circumscribing an equilateral triangle of side 15 cm.

This answer has an image. Please click on the question to read more.

Answer (2)

Devanshi Kulkarni

Jan 2, 2015

The length of minute hand of a clock is 14 cm. Find the area swept by the minute hand in 15 minutes.

Given, radius of the minutes hand= 14cm
In 15 minutes, the minutes hand of the clock rotates by 90°.
∴ Area cove...

Answer (1)

Devanshi Kulkarni

Jan 2, 2015

Calculate the total length of the metal wire required to make a set of ear-rings.

Sol:
Length of the wire in the shape of smaller arc = perimeter of the semicircle with diamter of 14 mm
= 1/2 [ 2 x 22/7 x 7]
= 22 mm
Length of the wire in the shape of longer arc = ...

Answer (1)

Chayan Mukherjee

Apr 2, 2014

1.       A car takes one hour to cover 47.52 km. If the diameter of its wheels is 84 cm, find the number             of revolutions made by a wheel in one second.

2.       The minute hand of a clock traces an area 51⅓ cm2 in 20 minutes. Find the length of the minute           hand.

3.       A thin wire 66 m long is bent in the form of a circle and kept on the ground. Find the area of the             ground enclosed by the wire.

4.       A piece of wire when bent to form of a circle will have a radius of 84 cm. if the wire is bent to                 form a square, what would be the length of a side of the square.

5.       A path of uniform width encloses a circular field. The external and the internal perimeters of the             path are 500 m and 300 m.  Find the width of the path.

6.       A circular pond of diameter 40 m is surrounded by 5 m broad pathway. Find the area of the path.

7.       A horse is tethered at the corner of a rectangular field by a rope 7 m long. Find the largest area             of the field in which the horse can graze.

8.       From the four corners of a square paper of side 24 cm, quarter circles with centres at the                     vertices of the square are cut off. If the radius of each of the quarter is 7 cm, find the area of the             paper left.

9.       From the three corners of a triangular paper, each side of which is 2k cm long, sectors of circles           of the radius k cm are cur off with centre at vertices of the triangle. What portion of the paper is             left?

10.       A bucket is raised from a well by means of a rope which is wound round a wheel of diameter 77             cm.  Given that the bucket ascends in 1 minutes 28 seconds with a uniform speed 1.1 m/s,                 calculate the number of complete revolutions the wheels makes in raising the bucket. ( Take π             = 22/7)  

Sol :
Post each question individually to get quick answer.

Answer (1)

Fahad Kolharkar

Dec 12, 2014

what is the minimum area of a right-angled triangle whose inradius is 1 unit?

This answer has an image. Please click on the question to read more.

Answer (1)

Devanshi Kulkarni

Jan 5, 2015

Find the area of the shaded region.

Sol:
Area of unshaded region of quadrant of a square = [Area of two quadrants - Area of the quadrant of the square]
= 2[1/4 x 22/7 x 7 x 7] - [7 x 7]
= 77 - 49
= 28

To...

Answer (1)

Devanshi Kulkarni

Jan 2, 2015

Prove that i) ∠CED=3∠CBD ii) CD=DA

Sol:
(i) Let ∠CBD = x.
∠COD = 2x [Angle made by arc at the centre is twice the angle made by it at any point on the remaining part of the circle.]
∠OCD = 2x [Alternate ang...

Answer (1)

Devanshi Kulkarni

Jan 2, 2015

In the figure there are 5 squares each of side 2 cm. 
(i) Find the radius of the circle.
(ii) Find the area of the shaded region ( Take π=3.14)

Please draw the figure and post it.

Answer (2)

3080 cm3 of water is required to fill a cylindrical vessel completely and 2310 cm3 of water is required to fill it upto 5 cm below the top. Find :
(1) radius of the vessel.
(2) height of the vessel.
(3) wetted surface area of the vessel when it is half-filled with water.

No answers yet.Be the first to answer

Answer (0)

Harmanpreet

May 3, 2014

Want solution to this question.....

This answer has an image. Please click on the question to read more.

Answer (3)

Rita

Feb 8, 2015

Find the area of a circle circumscribing an equilateral triangle of side 15 cm.

This answer has an image. Please click on the question to read more.

Answer (2)

Devanshi Kulkarni

Jan 2, 2015

The length of minute hand of a clock is 14 cm. Find the area swept by the minute hand in 15 minutes.

Given, radius of the minutes hand= 14cm
In 15 minutes, the minutes hand of the clock rotates by 90°.
∴ Area cove...

Answer (1)

Devanshi Kulkarni

Jan 2, 2015

Calculate the total length of the metal wire required to make a set of ear-rings.

Sol:
Length of the wire in the shape of smaller arc = perimeter of the semicircle with diamter of 14 mm
= 1/2 [ 2 x 22/7 x 7]
= 22 mm
Length of the wire in the shape of longer arc = ...

Answer (1)

Chayan Mukherjee

Apr 2, 2014

1.       A car takes one hour to cover 47.52 km. If the diameter of its wheels is 84 cm, find the number             of revolutions made by a wheel in one second.

2.       The minute hand of a clock traces an area 51⅓ cm2 in 20 minutes. Find the length of the minute           hand.

3.       A thin wire 66 m long is bent in the form of a circle and kept on the ground. Find the area of the             ground enclosed by the wire.

4.       A piece of wire when bent to form of a circle will have a radius of 84 cm. if the wire is bent to                 form a square, what would be the length of a side of the square.

5.       A path of uniform width encloses a circular field. The external and the internal perimeters of the             path are 500 m and 300 m.  Find the width of the path.

6.       A circular pond of diameter 40 m is surrounded by 5 m broad pathway. Find the area of the path.

7.       A horse is tethered at the corner of a rectangular field by a rope 7 m long. Find the largest area             of the field in which the horse can graze.

8.       From the four corners of a square paper of side 24 cm, quarter circles with centres at the                     vertices of the square are cut off. If the radius of each of the quarter is 7 cm, find the area of the             paper left.

9.       From the three corners of a triangular paper, each side of which is 2k cm long, sectors of circles           of the radius k cm are cur off with centre at vertices of the triangle. What portion of the paper is             left?

10.       A bucket is raised from a well by means of a rope which is wound round a wheel of diameter 77             cm.  Given that the bucket ascends in 1 minutes 28 seconds with a uniform speed 1.1 m/s,                 calculate the number of complete revolutions the wheels makes in raising the bucket. ( Take π             = 22/7)  

Sol :
Post each question individually to get quick answer.

Answer (1)

Fahad Kolharkar

Dec 12, 2014

what is the minimum area of a right-angled triangle whose inradius is 1 unit?

This answer has an image. Please click on the question to read more.

Answer (1)

Devanshi Kulkarni

Jan 5, 2015

Find the area of the shaded region.

Sol:
Area of unshaded region of quadrant of a square = [Area of two quadrants - Area of the quadrant of the square]
= 2[1/4 x 22/7 x 7 x 7] - [7 x 7]
= 77 - 49
= 28

To...

Answer (1)

Devanshi Kulkarni

Jan 2, 2015

Prove that i) ∠CED=3∠CBD ii) CD=DA

Sol:
(i) Let ∠CBD = x.
∠COD = 2x [Angle made by arc at the centre is twice the angle made by it at any point on the remaining part of the circle.]
∠OCD = 2x [Alternate ang...

Answer (1)

Devanshi Kulkarni

Jan 2, 2015

In the figure there are 5 squares each of side 2 cm. 
(i) Find the radius of the circle.
(ii) Find the area of the shaded region ( Take π=3.14)

Please draw the figure and post it.

Answer (2)

3080 cm3 of water is required to fill a cylindrical vessel completely and 2310 cm3 of water is required to fill it upto 5 cm below the top. Find :
(1) radius of the vessel.
(2) height of the vessel.
(3) wetted surface area of the vessel when it is half-filled with water.

No answers yet.Be the first to answer

Answer (0)

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