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L persegi = L 2 segitiga = 2 x 1/2 x 5 x 10 = 50 cm2
misal AB = s
karena pesegi, maka sisi"nya sama
AC²= AB² + BC²
AC² = s² + s²
10² = 2s²
100 = 2s²
50 = s²
√50 = s = 5√2 cm
K = 4 x 5√2 = 20√2 cm