Question

a larger cone with a slant of 42 yards. and a smaller cone with a slant of 30 yards and radius of 9 yards. What is the approximate surface area of the larger cone?
Answer
978.5 square yards
1,103.1 square yards
1544.4 square yards
2,162.3 square yards

Answer 1

?

Answer 2

slant of larger cone radius of larger cone
----------------- = ------------------
slant of smaller cone radius of smaller cone

42 radius of larger cone
--- = ------------------
30 9
radius of larger cone = 42/30 x 9 = 12.6
surface area = πrl + πr^2
= π (12.6)(42) + π(12.6)^2
Can you do calculation ? Do you understand the workings?

Answer 3

would it be 2,162.3 ?

Answer 4

I got 2161.3 :S

Answer 5

close enough lol thanks

Answer 6

You're welcome, I'm confused with my answer :(