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20cm = 4S
S = 20/4 = 5cm
(1/2D1)² + (1/2D2)² = S²
4² + (1/2D2)² = 5²
(1/2D2)² = 25-16 = 9
1/2D2=√9 = 3
D2= 3 x 2= 6cm
Luas = 1/2.D1 x D2 = 1/2 x 8 x 6 = 24cm²