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= 26 cm
diagonal ke satu dibagi 2, untuk mencari diagonal kedua
Pythagoras :
x² = 26² - 10²
= 676 - 100
x² = 576
x = 24 cm
maka diagonal kedua = 2(24) = 48 cm
Luas = 1/2 x d1 x d2
= 1/2 x 20 x 48
= 480 cm²