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D2 = 2/3D1
1/2 D1 D2 = Luas
1/2 * 2/3D1 *D1 = 432
2/6D1² = 432
D1² = 432 * 6/2
D1² =1.296
D1=36dm
D2 = 2/3* 36
D2= 24dm
Sisi² = 1/2D1² + 1/2D2²
Sisi² = 18² + 12²
S² = 324 + 144 = 468
S =√468 = √36*13
S = 6√13
Keliling = 4 * 6√13
= 24√13
432 = 2/6 x²
x² = 432.3
x² = 1296
x = √1296
= 36
diagonal₁ = 36
diagonal₂ = 2/3(36)
= 24
K = 8√117 cm