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=5×10=50 cm2
luas lingkaran =setengah vr2
=setengah×22per7×5
=15,4 cm2
=50+15,4
=65,4 cm2
1.luas tabung:v:v×r2×t
:22per7 ×r2 × t
:22per7×35
:110 dm
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