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4s = 104
s = 104 / 4
s = 26 cm
1/2(d1)² = s² - 1/2(d2)²
1/2d1 = √(s² - 1/2d2²
= √26² - 10²
= √676 - 100
= √576
= 24 cm
d1 = 24 * 2
= 48 cm
Luas = 1/2 d1 d2
= 1/2 * 48 * 24
= 24 * 24
= 576 cm²