This KS2 maths article explains how perimeter is the distance around a 2D shape and how to work it out on a grid.

TEKS Referenced: •3.1(A) - apply mathematics to problems arising in everyday life, society, and the workplace; •3.6(C) - determine the area of rectangles with whole number side lengths in ...

This interactive feature illustrates Archimedes' basic approach to calculating pi. It finds an approximation by determining the length of the perimeter of a polygon inscribed within a circle and ...

Archimedes' method finds an approximation of pi by determining the length of the perimeter of a polygon inscribed within a circle (which is less than the circumference of the circle) and the ...