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luas = (d1 x d2)/2
150 = (3d x 4d)/2
300 = 12 d^2
d^2 = 25
d= √25
d= 5
d1 = 3d= 3(5)= 15
d2=4d=4(5)= 20
jadi panjang diagonalnya 15 dan 20
L = d1 . d2 / 2
150 = 3x . 4x / 2
300 = 12x²
x = √25 = 5
maka d1 dan d2 = 3(5) dan 4(5) = 15 cm dan 20 cm