Hitunglah panjang jari jari lingkaran yang panjangnya 154,pakai cara.

L= 154 cm²
Ditanya= r?

L= πr²
154= 22/7 x r²
r²= 154/22/7
r²= 154 x 7/22
r²= 7 x 7
r= √49
r= 7 cm

Hopefully this is the best for you, stay focus and be the best, Buddy :)