Equilateral triangle: all sides of triangle are equal. Isosceles triangle: ... Perimeter of a triangle formula is a+b+c where a,b,c are the 3 sides of the triangle.

Types of triangle. Find out about scalene, equilateral, isosceles and right-angled triangles. ... Find out how to use a formula to work out the area of a flat shape.

Discover the different types of triangles and find out the difference between an equilateral, scalene, isosceles and right-angled triangle in this KS2 guide.