B. 10 cm
C. 49 cm
D. 100 cm
Jawaban:
Luas juring = (α/ 360°) π r²
78,5 = (90°/360°) x 3,14 x r²
78,5 = 0,785 x r²
r² = 78,5 / 0,785
r² = (78,5 X 1000) / (0,785 X 1000)
r² = 78500/785
B. 10 cm
C. 49 cm
D. 100 cm
Jawaban:
Luas juring = (α/ 360°) π r²
78,5 = (90°/360°) x 3,14 x r²
78,5 = 0,785 x r²
r² = 78,5 / 0,785
r² = (78,5 X 1000) / (0,785 X 1000)
r² = 78500/785
Editor: Azkaa Najmuts Tsaqib