3.The area of the base of a cone is 616sqcm its height is 48cm Then its
total surface area (in cm2) is
O [a]2816
O [b] 2861
O (c) 2618
O [d] 2681
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Step-by-step explanation:
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Answered by
1
Answer:
(a) 2816
The base of a cone is circular.
Area of a circle =πr
2
=616
⇒r
2
=
22
616×7
=196
=>r=14cm
Total surface area of a cone =πr(r+l)
where,
r is the radius of the cone and
l is the slant height.
For a cone, l=
r
2
+h
2
where, h is the perpendicular height.
Hence, l=
48
2
+14
2
2500
l=50cm
Hence, TSA of this cone, =
7
22
×14×(14+50)=2816cm
hope, it will help you.
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