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r = 5 cm
L.O = πr² = 3,14. 5²
= 78,5 cm²
L.A = Lp - L.O / 2
= 100-78,5 / 2
= 21,5 / 2
= 10,75 cm²
b) L.1/2 O = 1/2. L.O
= 1/2. 78,5
= 39,25 cm²
L.B = L.1/2 O - L.A / 2
= 39,25 - 10,75 / 2
= 28,5 / 2
= 14,25 cm²
A-B = 10,75 - 14,25
= -3,5 cm²