Question

12. The circumference of a circle is 31.4 cm. Find the radius and the area of the circle
Cake 1 = 3.14)​

Answer 1

Step-by-step explanation:

Circumference= 3.14x2xr

31.4 cm= rx6.28

31.4/6.28=r

5 cm = radius

Now area = 3.14 x r²= 3.14 x 25 =78.5 cm²

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Answer 2

Answer:

r = 5cm

Area = 78.5cm²

Step-by-step explanation:

Circumference = 2πr

31.4 = 2 x 3.14 x r

31.4/2 x 3.14 = r

314 x 100 / 2 x 314 x 10 = r

10/2 = r

5cm = r

Area = πr²

= 3.14 x 5²

= 314 x 25/100

 = 314/4-----(4 x 25 = 100)

Area = 78.5cm²

The radius of the circle is 5cm and the area is 78.5cm².