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100 : 4 = 25 (rumus phytagoras)
.....,20,25 = ...,4,5 = 3
3 * 5 = 15
15 * 2 = 30
belah ketupat = d1 * d2 : 2 = 40 * 30 : 2
1200 : 2 = 600
jadi,luas belah ketupat adalah 600
= 20 cm
panjang setiap sisi = 100 : 4
= 25 cm
(1/2 diagonal₂)² = 25² - 20²
= 625 - 400
= 225
1/2 diagonal₂ =√225
= 15
diagonal₂ = 15 x 2
= 30 cm
L = 1/2 x d₁ x d₂
= 1/2 x 40 cm x 30 cm
= 600 cm²