Chapter 26 Circles & Other Shapes. Circumference Remember circumference = distance around the outside of a circle C = π × d OR C = 2 × π × r.

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Presentation transcript:

Chapter 26 Circles & Other Shapes

Circumference Remember circumference = distance around the outside of a circle C = π × d OR C = 2 × π × r

Examples 1) A circle has a diameter of 18cm. What is its circumference 2) A dinner plate has a radius of 14cm. What is its circumference? 3) The circumference of a bike wheel is 190cm. What is its diameter?

Area A = π × r 2 Examples 1) A rug has a radius of 60cm. What is its area? 2) A plate has a diameter of 30cm. What is its area? 3) A circle has an area of 6.7cm 2. What is its radius and diameter?

Harder Examples Examples 1) The top of a can has a diameter of 8.4cm. What is its a) perimeter b) area?

2) Find the circumference & area of a semicircle which has a diameter of 15cm 3) Find the area of the following shape if its radius is 5.3cm

4) A circle has an area of 162cm 2. What is its circumference? 5) A circle has a circumference of 14π cm. What is its area?

Compound Shapes Examples Find the areas of the shapes below