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D1 = Diagonal 1
D2= Diagonal 2
L = Luas
1. L = D1 x D2 x 1/2
= 28 cm x 18 cm x 1/2
= 504 cm x 1/2
= 252 cm
2. L = D1 x D2 x 1/2
= 27 cm x 20 cm x 1/2
= 540 cm x 1/2
= 270 cm
3. L = D1 x D2 x 1/2
= 36 cm x 17 cm x 1/2
= 612 cm x 1/2
= 306 cm
4. D2= L : D1 x 2
= 240 cm : 30 cm x 2
= 8 cm x 2
= 16 cm
5.D1 = L : D2 x 2
= 225 cm : 18 cm x 2
= 12,5 cm x 2
= 25 cm
Semoga membantu :)