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120 = 4s
s = 120 : 4
s = 30 cm
1/2 d2 = √s2 - 1/2 d1^2
1/2 d2 = √900 - 576
1/2 d2 = √324 = 18 cm
d2 = 18 x 2 = 36 cm
Luas = 1/2 x d1 x d2
= 1/2 x 48 x 36
= 864 cm2
oya klo bisa jadikan sbg jawaban terbaik ya... lagi perlu nih....