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= 39² - 36²
1521 - 1296
√225
15 x 2 = 30cm
kllng persegi
= 4 x s
4 x 30
120cm
LPLimas
= Luas alas + jmlh luas sisi tegak
(s x s) + 4(1/2 x a x t)
(30 x 30) + 4(1/2 x 30 x 39)
900 + 4(585)
900 + 2340
3240cm²