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EC = 1/2 × BC
= 1/2 × 8
= 4 cm
L1 = 9 × 9
= 81 cm²
L2 = 1/2 × 4 × 8
= 16 cm²
L.diarsis = L1-L2
= 81 - 16
= 65 cm² (C)
24.
kell 1/2 lingkaran = 1/2 πD
= 1/2 × 22/7 × 7
= 11 cm
total = 14 + 14 + 7 + 11
= 46 cm (D)