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13 kali 10=130 cm
L alas : 10 cm x 10 cm
: 100 cm ²
L 4 segitiga = 10 cm x 13 cm x x 4
= 260 cm²
Luas permukaan = L alas + L 4 segitiga
= 100 cm² + 260 cm²
= 360 cm²