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= 20cm x 20cm
= 400cm²
L 4 sisi tegak = 4 x 1/2 x 20 x 24
= 960cm²
L permukaan = L alas + L 4 sisi tegak
= 400cm² + 960cm²
= 1360cm²
L alas = s x s
= 20 x 20
= 400
tinggi segitiga
√26^2 - 10^2
√ 676 - 100
√ 576
= 24
L segitiga = 4 x 1/2 x a x t
= 4 x 1/2 x 20 x 24
= 960
V = Lalas + t
= 400 + 960
= 1360