Question

Keliling lingakaran adalah 44 cm.luas juring AOB(v=22:7)adalah.....(jika diketahu sudut pusatnya 120 derajat)

Answer 1

Keliling lingkaran = 2πr

2πr = 44
πr = 44 / 2
πr = 22
r = 22 / π
r = 22 / (22/7)
r = 7 cm

luas juring :

120 / 360 * πr²
= 1/3 * 22/7 * 7 * 7
= 1/3 * 154
= 154 / 3 cm²
= 51,333 cm²

Answer 2

K = 2. 22/7 . r
44 = 22/7.2r
44.7 / 22 = 2r
14 = 2r
r = 7
L = 120/360 . 22/7.7.7
    = 1/3 . 154
    = 51, 33 cm²