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Old 07-07-2007   #1
taylor17brown
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Default Can anybody anythis geometry question?

The ratio of the corresponding edge lengths of two similar solids is 2:5. What is the ratio of their surface areas?a) 8:125b) 4:25c) 2:5d) 4:10
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Old 07-07-2007   #2
sushant
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The formula for surface area is 6a^2 , a is edge length.=>(6*2*2)/(6*5*5)=>4/25=>4:25=>(b)
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Old 07-07-2007   #3
Barb B.
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a
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Old 07-07-2007   #4
jonn
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4:25
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Old 07-07-2007   #5
Tom
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4:25. The areas are in the ratio of the squares of the sides.
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Old 07-07-2007   #6
daylan101292
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is there a choice e?
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Old 07-07-2007   #7
winter_new_hampshire
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4:25 because you multiply 2 times 2 and 5 times 5.Area is like a square.And the area of a square is two sides times each other.
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Old 07-07-2007   #8
sarkartapas2005
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d is the correct answerlet th
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Old 07-07-2007   #9
izzel
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It's b) because the ratio is 2:5 both sides are squared to give the surface area ratio which is 4:25
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Old 07-07-2007   #10
the_humor_guy
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Assuming the solid you are talking about is a regular shaped solid (cube, tetrahedron) with all the edges equal, the answer would be 4:25.This is because normally the formula for area consists of a square (y*y or y^2) of the edge (y). Hence, when calculating the ratio, the constants get cancelled and you get the ratio of the square of the edges.
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