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100 = 4 x s
s = 100 : 4
= 25
diagoal =√25² - 7²
= √625 - 49
= √576
= 24
L.= D1 x D2
2
= 14 x 24
2
= 168cm²
100 cm = 4 × S
S = 100 cm ÷ 4
S = 25 cm
D₂ = √S² - D₁²
D₂ = √25² - 7²
D₂ = 625 - 49
D₂ = 24 cm × 2 = 48 cm
Luas = D₁ × D₂ ÷ 2
Luas = 14 cm × 48 cm ÷ 2
Luas = 336 cm²