Question

Please, can you give me help with answer #1 - #3 and # 3. Thanks.

Answer 1

R=20
Circumference =2xpiexR
Circumference =2x3.14x20
=6.18x20
123.60cm
Radius=piexR^2
=3.14x400
=1256.00cm^2
[note R^2 means R square, square of 20 is 20x20=400]
Similarly,
R=8 and R=10.(just change the value of R)