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sis kubus ada 5 = 100 x 5 = 500 cm²
tinggi Δ sama kaki
t² = 13² - 5²
t² = 169 - 25
t = √144
t = 12
L. Δ = 1/2 x 12 x 10 = 60 cm²
segitiga ada 4 = 60 x 4 = 240 cm²
Luas bidang = 500 + 240 = 740 cm²