1.
L.A.=2πrh
=2(3.14)(3cm)(4cm)
= 6.28 x 12
=75.36cm²
S.A=L.A. + 2πr²
=75.36cm² + 2(3.14 x 3cm x 3cm)
=75.36+56.52cm²
2.
S.A.=4πr2
=4(3.14)(5m×5m)
=4(3.14)(25m²)
3.
S.A.=2lh+2lw+2hw
=(2)(5m)(2m)=20m²
=(2)(5m)(1m)=10m²
=(2)(2m)(1m)=4m²
=20m+10m+4m
4.
S.A.=6s²
=(6)(9cm×9cm)
=(6)(81cm2)
5.
S.A.=lp+bh
=(11mm)(10mm)+(4mm)(3mm)
=110mm²+ 12mm²
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Answers & Comments
1.
L.A.=2πrh
=2(3.14)(3cm)(4cm)
= 6.28 x 12
=75.36cm²
S.A=L.A. + 2πr²
=75.36cm² + 2(3.14 x 3cm x 3cm)
=75.36+56.52cm²
=131.88cm²
2.
S.A.=4πr2
=4(3.14)(5m×5m)
=4(3.14)(25m²)
=314m²
3.
S.A.=2lh+2lw+2hw
=(2)(5m)(2m)=20m²
=(2)(5m)(1m)=10m²
=(2)(2m)(1m)=4m²
=20m+10m+4m
=34m²
4.
S.A.=6s²
=(6)(9cm×9cm)
=(6)(81cm2)
=486cm²
5.
S.A.=lp+bh
=(11mm)(10mm)+(4mm)(3mm)
=110mm²+ 12mm²
=122mm²