Angles subtended by opposite arcs
When a quadrilateral is inscribed on a circle, the angles that are opposite each other are related.
Measure ∠D and ∠F. What do they add up to? Move the points around and try again.
The Sum of the Cubes of the First N Natural Numbers
Adding and Subtracting Fractions
Isabelle Garand_equilateral triangle
Discovering the Pythagorean Theorem