Maths

Given that the radius of a circle is 7 m, find the diameter of the circle.

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Diameter of the circle

[pic 1]

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Given that the diameter of a circle is 5 mm, find the radius of the circle.

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Radius of the circle

[pic 2]

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Find the circumference of a circle with diameter 3 cm.

(Take [pic 3].)

[pic 4]

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Circumference of the circle

[pic 5]

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Find the circumference of a circle with diameter 14 cm.

(Take [pic 6].)

[pic 7]

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Circumference of the circle

[pic 8]

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Find the circumference of a circle with radius 3 cm.

(Take [pic 9].)

[pic 10]

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∵  [pic 11]

∴        [pic 12]

Circumference of the circle

[pic 13]

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Find the circumference of a circle with radius [pic 14]cm.

(Take [pic 15].)

[pic 16]

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∵  [pic 17]

∴        [pic 18]

Circumference of the circle

[pic 19]

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If the base area and the height of a prism are 5 cm2 and 3 cm respectively, find the volume of the prism.

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Volume of the prism

[pic 20]

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If the volume and the base area of a prism are 273 cm3 and 3 cm2 respectively, find the height of the prism.

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Let h cm be the height of the prism.

        [pic 21]

∴        The height of the prism is 91 cm.

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