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Luas persegi = 10 x 10 = 100 cm²
Luas sisi limas yang lain = (360-100)/4 = 65 cm²
Sisi miring = (10 x R) = 65 x 2
10 R = 130
R = 13
Tinggi limas = 13² = 5² + T²
169 = 25 + T²
T = √169 - 25
T = √144
T = 12
Volume Limas = 1/3 * 100 * 12
= 400 cm³