All ISEE Upper Level Math Resources
Example Question #1 : Isosceles Triangles
Two sides of an isosceles triangle have lengths 3 feet and 4 feet. Which of the following could be the length of the third side?
An isosceles triangle, by definition, has two sides of equal length. Having the third side measure either 3 feet or 4 feet would make the triangle meet this criterion.
3 feet is equal to inches, and 4 feet is equal to inches. We choose 36 inches, since that, but not 48 inches, is a choice.
Example Question #1 : How To Find The Length Of The Side Of An Acute / Obtuse Isosceles Triangle
The triangles are similar. Solve for .
Because the triangles are similar, proportions can be used to solve for the length of the side: