pertanyaan nya di foto

1. c
2.
3,14 x 80
=251,2
3.
66=22/7 x 2xr
21/2=r
10.5=r

4.
22/7 x 14 x 14 = 616

1. C. Tembereng
2. D= 80 cm
K= 3, 14 x 80
= 251, 2 cm
D.

3. D= 66 cm
K= phi x D
D = K/phi
66/227
= 21 cm
r = 21 : 2
= 10,5 cm
C.

4. D= 28 cm
r = 14cm

Luas = phi x r²
= 22/7 x 14²
=22/7 x 196
= 616 cm²
A.