Math Is Fun Forum

balasvce

Member

Registered: 2006-12-20

Posts: 37

solve and explain

39) Isosceles trapezoid having base as 18 foot and the other

pair of sides as (x/3) foot each.Perimeter of the trapezoid

was given as 77 foot.

Col A : Largest side of the Trapezoid

Col B : 32 foot.

which is greater col a or col b

Stanley_Marsh

Member

Registered: 2006-12-13

Posts: 345

Re: solve and explain

denote the unknown side as y , perimeter 77=2*(x/3)+18+y
we get 2x/3+y=59
since 18 is the base , so y<18
y=59-2x/3<18
then we get   20.5<x/3
Now we have all the length of this trapezoid ,  18, 20.5<x/3 ,y<18
assume y is close to 0 , then x/3<29.5
so 32 foot is greater

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Numbers are the essence of the Universe

LQ

Real Member

Registered: 2006-12-04

Posts: 1,285

Re: solve and explain

http://mathworld.wolfram.com/IsoscelesTrapezoid.html

Yeah man, that's really a good name of a that simple trigonometrical figure, a good way of getting people to describe what they mean with hands and feet (kidding)

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I see clearly now, the universe have the black dots, Thus I am on my way of inventing this remedy...