Kerucut tanpa alas, maka:
r = 20 ÷ 2 = 10 cm
L = π × r × s
= 3,14 × 10 × 26
= 816,4 cm²
Jawaban: B.
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Kerucut tanpa alas, maka:
r = 20 ÷ 2 = 10 cm
L = π × r × s
= 3,14 × 10 × 26
= 816,4 cm²
Jawaban: B.