What is the approximate surface area of the larger cone?

1544.4 square yards

978.5 square yards

2,162.3 square yards

1,103.1 square yards

Question

What is the approximate surface area of the larger cone?

 1544.4 square yards

978.5 square yards

2,162.3 square yards

1,103.1 square yards

anonymous · Answer

attachment

amistre64 · Answer

are these spose to be similar cones?

anonymous · Answer

yes

amistre64 · Answer

surface area is defined as area of sides and bases right?

amistre64 · Answer

area of a circle should already be known or at least heard of

the area of a cone i believe is pi r s

these sound familiar?

anonymous · Answer

yea

amistre64 · Answer

linear measures scale by a common ratio; so 30s=42 when s=7/5

r of the other cone is then 9*7/5

amistre64 · Answer

pi r^2 + pi r s

given s = 42 and r = 63/5

amistre64 · Answer

or  pi r (r+s)

anonymous · Answer

sorry but formula of cone is $$A=1/3.\pi.r(r+l)$$

amistre64 · Answer

the "formula of a cone" ???

amistre64 · Answer

http://math.about.com/od/formulas/ss/surfaceareavol_2.htm i think you might be confusing volume in there someplace

anonymous · Answer

oh sorry. . .