Curated OER
Calculating the Hypotenuse
In this triangles learning exercise, students use Pythagoras' theorem to find the hypotenuse of a triangle. Students solve 20 problems and also calculate the length of the diagonals in rectangles. This page is intended for online use but...
Annenberg Foundation
Annenberg Learner: From Corner to Corner
Measure the lengths and diagonals of three squares with a ruler. Look over your measurements and try to come up with a rule of thumb for estimating the length of a diagonal if you know the length of a side.