Please y pakai cara Kalau gk keliatan comenct aj yups

Diketahui
L = 154 cm²
π = 22/7

Ditanya
a). Jari jari
b). Keliling

Jawaban

a). Jari jari

L = π x r²
154 = 22/7 x r²
(154x7) = 22 x r²
1078 = 22 x r²
1078/22 = r²
49 = r²
√49 = r
7 = r

Jari jari lingkaran = 7 cm ✔

b). Keliling

K = 2 x π x r
K = 2 x 22/7 x7
K = 44 cm ✔

Luas=154 cm²
phi= 22/7
Luas= phi.r.r
154=22/7.r²
r²=22/7:154=7/22x154
r=√49=7
keliling=2.phi.r=2x22/7x7=44