Tolong bantu ya. luas lingkaran r = 7 cm rumus = 3,14

L. Lingkaran = phi. r^2
= 22/7x7x7
= 154cm^2
kalo kelipatan 7 gunakan 22/7

1.
Luas =

phi × r × r =

22/7 × 7 cm × 7 cm =

1.078/7 =

154 cm^2

2.
Luas =

phi × r × r =

3,14 × 10 cm × 10 cm =

31,4 cm × 10 cm =

314 cm^2.

Smg membantu^_^