Question

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Answer 1

1answer).

L=20cm

B=15cm

C=12cm

Total surface area of cuboidal=

2(lb+bh+hl)

2(20×15+15×12+12×20)

2(300+180+240)

2(720)

1440cm²

2answer).

base=15cm

height=35cm

curved surface area of cylinder=

=2πrh

=2×22\7×15×35

=44×5×15

=3300cm²

3answer).

b=l=25cm

r=15cm

curved surface area of cone=

=πrl

=3.14×15×25

=1177.5cm²

Total surface area of cone=

curved surface area+πr²

=1177.5+3.14(15)²

=1177.5+706.5

=1884cm²

4answer).

R=14cm

Volume of cone=

4πr²

=4×22\7×14×14

=88×28

=2464cm²

5answer).

h=20cm

r=10cm

volume of cylinder=

πr²h

=3.14×10×10×20

=6280cm³

6answer).

h=9cm

area of base=1386cm²

area of base=πr²

πr²=1386

r²=1386×22\7

r²=63×7

r=√(441)

r=21

volume of cone=1\3πr²h

=1\3×22\7×21×21×9

=1\3×22×3×21×9

=22×21×9

=4158cm²

7answer).

d=12cm

r=d\2=12\2=6cm

volume of hemisphere=2\3πr³

=2\3×3.14×6×6×6

=44×72\7

=3168\7

=452.16cm³

8answer).

d=21cm

r=d\2=21\2=10.5

surface area of sphere=4πr²

=4×22\7×10.5×10.5

=1386cm²

9answer).

edge of cube =8cm

volume of cone=(edge)³

=(8)³

=512cm³

10answer).

h=20cm

r=10cm

curved surface area of cylinder=

2πrh

=2×3.14×10×20

=1256cm³

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