Jawaban:
a. L1=2πr(r+t)
=2×22/7×7×(7+20)
=44×27=1.188 cm²
L2=πr²
=22/7×7×7=1.078/7=154 cm²
Lgabung=1.188+154=1.342 cm²
b. V1=πr²t
=22/7×7×7×20=21.560/7=3.080 cm³
V2=4/3πr³
=4/3×22/7×7×7×7=22×7×7×4/3
=4.312/3=1.437,33 cm³
Vgabung=3.080+1.437,3=4.517,33 cm³
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Jawaban:
a. L1=2πr(r+t)
=2×22/7×7×(7+20)
=44×27=1.188 cm²
L2=πr²
=22/7×7×7=1.078/7=154 cm²
Lgabung=1.188+154=1.342 cm²
b. V1=πr²t
=22/7×7×7×20=21.560/7=3.080 cm³
V2=4/3πr³
=4/3×22/7×7×7×7=22×7×7×4/3
=4.312/3=1.437,33 cm³
Vgabung=3.080+1.437,3=4.517,33 cm³