luas selimut kerucut:
π r s = 22/7 x 14/2 x 25
= 550 cm²
luas lingkaran = π (r2²-r1²)
= 22/7 x (20²-7²)
=22/7 x (400-49)
=22/7 x 351
= 1103,14 cm²
luas total = 550 + 1103,14 = 1653,14 cm²
utk 20 topi diperlukan:
1653,14 x20= 33.062,8 cm²
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luas selimut kerucut:
π r s = 22/7 x 14/2 x 25
= 550 cm²
luas lingkaran = π (r2²-r1²)
= 22/7 x (20²-7²)
=22/7 x (400-49)
=22/7 x 351
= 1103,14 cm²
luas total = 550 + 1103,14 = 1653,14 cm²
utk 20 topi diperlukan:
1653,14 x20= 33.062,8 cm²