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luas = (38+45)/2 x 18=83x9 = 749
2.luas = (d1 x d2)/2 = 16x28 / 2 =224
3.Kell persegi = 4s = 72; s = 72/4=18
maka luas = sxs= 18x18=324
4.luas = (AC x BD )/2
72 = 8 x BD / 2
144 = 8 x BD
BD= 144/8 =18
(38 + 45) × 18 = 83 × 18 = 1494 cm²
2.
16 × 28 ÷ 2 = 448 ÷ 2 = 224 cm²
3.
72 ÷ 4 = 18
18 × 18 = 324 cm²
4.
L = D1 × D2 ÷ 2
72 cm² = 8 cm × D2 ÷ 2
144 cm² = 8 cm × D2
D2 = 144 cm² ÷ 8 cm = 18 cm