Right, there are four different types of triangle. First, here's an isosceles triangle, it has two equal length sides and two equal angles. Oh! Very clever! Now we have an equilateral triangle.

These reflected rectangles are example of congruent ... Isosceles triangles ABC and DEF are not proportionality the same. The base in EF is twice the size as BC. EF ÷ BC = 6 ÷ 3 = 2. The sides ...