How tall is the school?

Grade 10s used mirrors to explore similar triangles. They needed to apply their knowledge of the law of reflection with a plane mirror which was learned in science class.

We made a triangle with us (height to eyes) and the distance between the mirror and our feet. We had to be sure we could see the edge of the school roof in the mirror without leaning over.

Next we measured the distance between the mirror and the school.

sometimes there were obstacles!

We then calculated the height of the school using similar triangles.

We were hoping to use shadows too, but sadly there hasn’t been sun during math class for the last week!