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Diameter alas = 14 cm, maka r = 7 cm
T = 24 cm
Pertama, harus cari dulu s (garis lukis)
s = √r² + t²
= √7² + 24²
= √49 + 576
= √625
= 25 cm
Lalu, baru dicari luasnya
L = πr² + πrs
= 22/7 x 7 x 7 + 22/7 x 7 x 25
= 22 x 7 + 22 x 25
= 154 + 550
= 704 cm²
Rumus sederhananya gini,
= πr (r +s)
= 22/7 x 7 (7 + 25)
= 22 (32)
= 704 cm²