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= 2 . 22/7 . 21 . 20
= 2640 cm²
2. s² = r²+t²
= 15² + 20²
= 225+400
=625
s = √625
= 25 cm
L = Πr² + Πrs
= 3,14 . 15² + 3,14 . 15 . 25
= 706,5 + 1177,5
= 1884 cm²
=2×22/7×21×20
=2.640 cm2
2.luas kerucut = Πr×(r+s)
=3,14×15×(15+20)
=3,14×15×35
=1.648,5 cm2