You'll like draw a perfect square or rectangle by drawing congruent angles to form the box, and then congruent triangles (equilateral triangles) form the pitched roof. An easy way to remember ...

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 ...

to build on students' knowledge of triangle and develop ... work in proposing definitions of other mathematical concepts (e.g., quadrilaterals) to highlight inclusive relations between triangles (e.g.

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 ...

They often identify them solely based on their resemblance to prototypes: e.g., a shape will be called a triangle if it looks like an equilateral triangle with ... Elicit discussion around the ...