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= √625 - 81
=√544
t prisma = √544 - 12²
= √544 - 144
=√400
=20cm
V limas = L.alas x t prisma : 3
= 24 x 18 x 20 : 3
=2880
pr²=pq²+qr²
pr²=24²+18²
pr²=576+324
pr=√900=30
gambar titik o di tengah gari pr
to²=25²-15²
to²=625-225
to=√400
to=20
b) volume = 1/3×Luas alas×tinggi=1/3×24×18×20= 2880