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tinggi (t) = 80 cm
Gunakan Teorema Phytagoras
s =
=
=
=
= 100 cm
Luas selimut
= x r x s
= 3,14 x 60 x 100
= 18.840 cm²
Luas permukaan = Luas lingkaran + luas selimut
= ( x r²) + 18.840
= (3,14 x 60 x 60) + 18.840
= 11.304 + 18.840
= 30.144 cm²