Question

Tolong Bantu jawab yy
(no4:sudutnya 90°)

Answer 1

154 = phi × r × r
154 = 22/7 × r×r
154 : 22/7 = r×r
154 × 7/22 = r×r
7× 7 = r× r
r =7

Luas segitiga = 1/2 × 7 × 7
= 1/2 × 49= 24,5

90°/360°= luas juring AOB/ 154
1/4 = luas juring AOB /154
Luas juring AOB = 154/ 4
Luas juring AOB = 38,5


Luas tembereng = Luas juring - luas segitiga
Luas tembereng = 38,5 - 24,5
Luas tembereng = 14 cm persegi