YouTube on MSNOpinion

Determine the value of X using third angle theorem and congruent triangles

👉 Learn how to solve for unknown variables in congruent triangles. Two or more triangles are said to be congruent if they ...
YouTube on MSN

Where does the interior angle sum theorem come from?

👉 Learn about the interior and the exterior angles of a polygon. A polygon is a plane shape bounded by a finite chain of ...
BBC

Module 4 (M4) - Geometry and measures - Circle theorems

Circle theorems are properties that are true for all circles, regardless of their size. There are six theorems to learn and recognise. Questions can have a combination of theorems. It is important to ...
Quanta Magazine

Why Triangles Are Easy and Tetrahedra Are Hard

Do you think there’s a triangle whose angles measure 41, 76 and 63 degrees? At first, answering this may seem easy. From geometry class we know that the sum of the measures of the interior angles of a ...
The Guardian

The wrong angle on Pythagoras’s theorem

Catherine Scarlett responds to an article about US teenagers who claim to have proved the theorem using trigonometry While it is heartening to see enthusiastic mathematical inquiry in young people and ...