Diameter lingkarannya 70 cm. Luasnya adalah?

Penyelesaian :

L = πr²
L = [tex] \frac{22}{7} [/tex] x 35 x 35
L = 22 x 5 x 35
L = 110 x 35
L = 3.850 cm²

Semoga Membantu :)

r = d/2
r = 70/2
r = 35 cm

[tex]luas \: lingkaran \: = \pi {r}^{2} \\ = \frac{22}{7} \times 35 \times 35 \\ = 22 \times 5 \times 35 \\ = 3850 {cm}^{2} [/tex]