Question

Luas Lingkaran: 154 Cm²
Berapa Diameter nya?

Tolong caranya..

Answer 1

L = πr² = 154 cm²
r² = 154 : π
r² = 154 : 22/7
r² = 154 x 7/22
r² = 49
r = √49
r = 7 cm

diameter = 2r =2x7 cm = 14 cm

Answer 2

L = π×r²
154 = 22/7×r²
r² = 154×7/22
r² = 49
r = √49
r = 7 cm
d = 2×r
   = 7 × 2 = 14 cm
Semoga bermanfaat :)