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Learn circumference, radius, pi and more through music! From the Math Upgrade course at learningupgrade.com INTRODUCTION A plane shape is a two dimensional shape, it has width and breadth but no thickness. TYPES OF PLANE SHAPES 1)Triangles 2)Quadrilaterals 3)Polygons

i. Regular ii. Irregular

**THE CIRCLE**
Parts of a Circle

Centre Arc Radius Chord Diameter

**THE AREA OF A CIRCLE**

**HOW TO DERIVE THE AREA OF CIRCLE FORMULA**

The formula for the area of a Parallelogram is BASE x HEIGHT(see diagram 3) step 1) Cut up the circle in sectors step 2) Arrange them in the shape of a parallelogram, the base is the circumference of the circle = II x r and the height is radius = r step 3) Calculate the area of the parallelogram (base x height) and that formula is the Area of a circle.

step 4) Area of a Circle = pi x r x r (see, diagram 4)**For added information watch the video (in videos on this page) entitled Finding radius, diameter, circumference and area of a circle**.