Question

(1) 35 cm,
m.
4. Find the radius of a circle whose circumference is 57.2 cm.
5. Find the diameter of a circle whose circumference is 63.8 m.
T1​

Answer 1

Answer:

4 - 114.4

5 - 255.2

Step-by-step explanation:

circumference is half of circle so,

4 - radius = 57.2*2 = 114.4

diameter is half of radius and 1/4th of circumference if circle so,

5 - diameter = 63.8*4 = 255.2

Answer 2

Answer:

4. radius= 9.1cm

4. radius= 9.1cm5. diameter= 20.3 m

Step-by-step explanation:

4. Let r be the radius

Circumference of circle= 2πr

57.2= 2×22/7× r

57.2×7/ 2×22= r

(On dividing 57.2 by 2 and 22 we get 1.3)

1.3×7=r

9.1=r

5. Let the radius be r

Circumference of circle= 2πr

63.8= 2×22/7× r

63.8×7/2×22= r

(On dividing 63.8 by 2 and 22 we get 1.45)

1.45×7=r

10.15=r

Radius= 10.15 m

Diameter= 2× radius

= 2×10.15

= 20.3 m