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Kalau bingung 13 dari mana, itu pake tripel phytagoras (5*, 12, 13)
*panjang sisi alas dibagi 2 terlebih dahulu
= 25+144
= √169
= 13 cm
Lp = S² + 4L∆
= 10² + 4.½.10.13
= 100 + 260
= 360 cm²