YouTube on MSN

Finding the length of a triangle using algebraic expression and perimeter - Online tutor

👉 Learn how to find the area and perimeter of triangles. A triangle is a shape of three sides. The area of a shape is the ...
BBC

Area of triangles, parallelograms and trapeziums

A GCSE Maths video about area of triangles, parallelograms and trapeziums. This video explains hows to calculate the area of a triangle, parallelogram and trapezium using worked examples. Find out ...
YouTube on MSN

Finding the length of a side of a equilateral triangle given the perimeter - Online Tutor

👉 Learn how to find the area and perimeter of triangles. A triangle is a shape of three sides. The area of a shape is the ...
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 ...