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. Three sides of equal length andall the angles are 60 ...

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. Three sides of equal length andall the angles are 60 ...

Big Idea – We can describe, measure, and compare spatial relationships ... formal geometric properties like symmetrical movement, equal angles, and equal sides. You'll be using Sketch 1 of this file ...