keliling lingkaran yg memiliki luas 616 cm

L = 616 cm²
[tex] \pi [/tex]r² = 616 cm²
22/7 x r² = 616 cm²
r² = 616 cm² ÷ 22/7
r² = 616 cm² x 7/22
r² = 196 cm²
r = √196 cm²
r = 14 cm

Keliling:
= [tex] \pi [/tex](r x 2)
= 22/7 x (14 x 2)
= 22/7 x 28
= 88 cm

Rumus Luas = 22/7 x r²
616cm ² = 22/7 x r²
r² = 616cm² : 22/7 = 616cm² x 7/22
r² = 196cm
r = 14cm
Rumus Keliling = 22/7 x diameter
Kel = 22/7 x (2 x 14) = 22/7 x 28 = 88cm