¶ 1988 AMC8 Problem 9
Problem:
An isosceles triangle is a triangle with two sides of equal length. How many of the five triangles on the square grid below are isosceles?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
All but the triangle in the upper right are isosceles.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions