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Jawab
Diketahui =
Sudut AOB = 90 derajat
r = 7 cm
Juring = 360 / 90 = 1/4 bagian lingkaran
luas 1/4 lingkaran =
1/4 * ( π * r * r )
1/4 * ( 22/7 * 7 * 7 )
1/4 * 154
154/4
38,5 cm ²
Maka Luas Juring AOB = 38,5 cm²
jawab
180°/360° x π7²
1/2x 22/7.49 cm
1/2x 154 cm
77 cm²