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120 = 4s
s = 120 / 4 = 30 cm
d1 = 48 cm
1/2 d1 = 24 cm
Mencari diagonal 2
1/2 d2 = √s² - 1/2 d1²
1/2 d2 = √30² - 24²
1/2 d2 = √900 - 576
1/2 d2 = √324
1/2 d2 = 18 cm
d2 = 36 cm
Mencari luasnya
L = d1 × d2 / 2
L = 48 × 36 / 2
L = 864 cm²
L = 1/2 kali d1 kali d2
1/2 kali 48 kali 36 = 864