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2 Dimensional Shapes 2
- 1. 10/4 Bell Activity: How many triangles are there in this diagram?
- 3. The perimeter of this shape has a special name. What is it? My perimeter is called The Circumference
- 4. These things are very important in calculating the circumference of a circle. Remember a round pi (spelled wrong)
- 5. Pi Pi is a large number that goes on forever But we use 3.14 to be approximately equal to pi. r d r = radius d = diameter To calculate the circumference of a circle You do 3.14 x d Or 2 x 3.14 x r Look at Mr Lock’s example on the board.
- 6. Use your calculator to calculate the circumference of these shapes To calculate the circumference of a circle You do 3.14 x d Or 2 x 3.14 x r 11cm 3cm 1.56cm
- 7. This circle has circumference 298cm ². What do you think it’s diameter is? It’s radius?
- 9. Try these 5cm 2.5cm 13cm
- 10. Find the area of this shape… 24.6cm
- 12. Without looking back, write down how you construct a triangle using ruler and compasses Now write down 6 quadrilaterals (and how to find their area)