The area of the rectangle is the length multiplied by the width. The length and width of the rectangle are the base and perpendicular height of the triangle, they are at right-angles to each other.

(typical responses: size, all triangles, all coloured, all have three sides, all pointed the same way (orientation), all have angles). 2. After the initial discussion about the static triangle images, ...

Big Idea – We can describe, measure, and compare spatial relationships. to build on students' knowledge of triangle and to develop students' reasoning with properties of triangle to develop students' ...