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56 cm = 4 x s
s = 56/4
s = 14 cm
Tp² = √24² + 7²
= √576 + 49
=√625
= 25
luas permukaan = L.alas + jumlah sisi tegak
= 14 x 14 + (4 x 1/2 x 14 x 25)
= 196 + 700
= 896 cm²