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National 4; Perimeter and area Circumference and area of a circle. In this National 4 Lifeskills Maths study guide, you can revise how to find the perimeter and area of triangles, quadrilaterals ...

The perimeter of a circle is also called its circumference. To estimate the circumference of a circle, you can use this formula: C = pi x D, where C is the circumference, pi is 3.14, and D is the ...