HELP!! {Find the surface area of the cone.}

Question

anonymous · Answer

I keep getting it wrong! Help D:

anonymous · Answer

I know about SA = πr2 + πrl

anonymous · Answer

but i keep getting my answer wrong. its completely off.

anonymous · Answer

curved surface=pi r l
base= pi r^2
l^2=14^2+8^2=196+64=260
$$l=\sqrt{260}$$
$$S.A=\pi r ^{2}+\pi r l=\pi r \left( r+l \right)=\frac{ 22 }{7 }\times8 \left( 8+\sqrt{260}\right)$$
$$=\frac{ 176 }{ 7 }\left( 8+\sqrt{4*65} \right)$$
$$=\frac{ 176 }{ 7}\left( 8+2\sqrt{65} \right)=\frac{ 352 }{ 7 }\left( 4+\sqrt{65} \right)$$
solve and get the required answer.

anonymous · Answer

solve 4 + 65 ?

anonymous · Answer

@surjithayer  i couldnt get an answer with your problem. i think somethings off.

anonymous · Answer

@surjithayer  HELLO??

anonymous · Answer

i got 5040 and thats wrong. @surjithayer

whpalmer4 · Answer

If you're getting 5040 the fault is yours.  $$\frac{352}{7}(4+\sqrt{65}) = \frac{352}{7}*(4+8.062) = \frac{352}{7}*12.062 = $$

whpalmer4 · Answer

Hint: 350/7 = 50, so your answer should be around 600.