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t=16
A.s=√t²+r²
=√16²+12²
=√256+144
=√400
s=20 cm. Keterangan:t=tinggi
r=jari-jari
s=Panjang Garis Pelukis
B.Luas permukaan
LP=La+Ls
* La=Πr²
=3,14×12²
=3,14×144
La=442,16 cm²
* Ls=Πrs
=3,14×12×20
Ls=753,6 cm²
LP=La+Ls
=442,16+753,6
LP=1195,76 cm²
Keterangan
LP=Luas Permukaan
La=Luas alas
Ls=Luas selimut