Question

The height of a cone is 21 cm and slant height is 28 cm. Find the Total surface area of cone.

pls Give Solutions I Have Emergency Now pls​

Answer 1

Answer:

h Height 21   cm

l        slanting height 28 cm

ans 2706.69337cm2

Step-by-step explanation:

Using the formulas

A=πrl+πr2

l=r2+h2

Solving forA

A=π(l2﹣h2+ll2﹣h2)=π·(282﹣212+28·282﹣212)≈2706.69337cm²

Hope this will help you

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Answer 2

Answer:

h = 21cm

l = 28cm

l²=r²+h²

r=√(l²-h²)

r=√(28²-21²)

r=√(784-441)

r=√343

r=7√7cm

TSA of cone = πr(l+r)

=22/7 ×7√7×(28+7√7)

=22×√7×7(4+√7)

=154√7(4+√7)

=154(4√7+7)cm²

√7=2.64

TSA=154(4×2.64+7)

=154(10.56+7)

=154×17.56

TSA=2704.24cm²