Question

35 POINTS PLS HELPPP

Answer 1

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For first Question:-

Given:-

Circumference of circle = 56 cm

Find:-

Diameter of circle

Explanation:-

we know,

★ Circumference of circle = 2πr

where , π = 3.14

r = radius

➩ 56 = 2 × 3.14 × r

➩ r = 56 × /(2 × 3.14)

➩ r = 28/3.14

➩ r = 2800/314

➩ r = 8.92 cm

Hence:-

Diameter will be = 8.92 × 2 = 17.84 cm

_____ _____________________

For second Question:-

Given :-

Circumference of circle = 25.12 cm

Find:-

Radius of circle

Explanation:-

we know,

★ Circumference of circle = 2πr

➩ 25.12 = 2 × 3.14 × r

➩ r = 25.12/(2 × 3.14)

➩ r = 12.56/3.14

➩ r = 1256/314

➩ r = 3.99 cm

Hence:-

Radius of circle = 3.99 cm

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Answer 2

Answer:

circumference = 2*π*r

=> 2*3.14*(7.5/2)

=> 23.55

A = πr²

A = 3.14 * 3.75*3.75 = 44.15

=> circumference =2*3.14 * 16.3 = 102.3

=> A = 3.14 * 16.3 * 16.3 = 834.3