please pake cara jangan asal jawab

1. Keliling=2πr
132=2x22/7xr
132=44/7xr
r=132x7/44=21cm

2. L=πr^2
616=22/7xr^2
r^2=616x7/22
r^2=196
r=√196=14 cm

3.K=2πr
66=2x22/7xr
r=66x7/44xr
r=10,5
d=10,5x2=21 cm

4.L=pxl=30x20=600 cm^2
K=(2xp)+(2xl)
(2x30)+(2x20)=100 cm

5. L=3,14x25x25=1962,5 cm^2
K =2x3,14x25=157cm