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luas ∆ ABC
= 1/2 x 10 x 10
= 50 cm²
luas ∆ ACD
= 1/2 x 10√2 x 10√2
= 1/2 x (10√2)²
= 1/2 x (100 x 2)
= 100 cm²
maka luas bangun ABCD
= luas ∆ ABC + luas ∆ ACD
= 50 cm² + 100 cm²
= 150 cm²
jawab. A.