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gh =\/(13^2 - 5^2) = \/144 = 12 cm
L abcd = s^2 = 8^2 = 64 cm^2
L efg = a ×t / 2 = 14 × 12 /2 = 84 cm^2
jumlah luas abcd dan efg tanpa daerah arsiran = 64+84-24= 124 cm^2
(c)