Question

True or False? An isosceles triangle cannot be an equilateral triangle, but an equilateral triangle can be an isosceles triangle.

Answer 1

An isosceles triangle has at least two equal sides. An equilateral triangle has all three sides equal. If a triangle is isosceles, it might not have 3 equal sides, but if a triangle is equilateral, it will always have at least two equal sides. So, the statement is true.

Answer 2

False
because

The Isosceles triangle shown on the left has two equal sides and two equal angles.

The Equilateral triangle shown on the left has three equal sides and three equal angles.

Answer 3

http://www.mathwarehouse.com/geometry/triangles/triangle-types.php

Answer 4

However, an isosceles triangle has at the least 2 equal sides and 2 equal angles. It could have 3.