Triangle ABC is a right-angled triangle. It is reflected about one of its edges and the two triangles together form an acute isosceles triangle. Along which edge is it reflected?

A rectangle’s length is $5$5 times its width. How many isosceles right-angled triangles can fit exactly into the rectangle if the equal side lengths of the triangle measure the same as the width of the rectangle?

Outcomes

9P.MG3.02

Determine, through investigation using a variety of tools and describe the properties and relationships of the angles formed by parallel lines cut by a transversal, and apply the results to problems involving parallel lines