Area of a circle Radius r (m)012345 Area A (m 2 ) 0 3.1 12.6 28.350.3 78.5 when r = 2.5 A = 20 (to 2sf) when A = 30 r = 3.1 (to 2sf)

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Presentation transcript:

Area of a circle Radius r (m) Area A (m 2 ) when r = 2.5 A = 20 (to 2sf) when A = 30 r = 3.1 (to 2sf)

Temperature of a cup of coffee After 12 minutes the temperature is 56  C (nearest  ). The temperature is 70  C after 6 minutes (nearest minute). Time (min) Temperature (  C)

Drawing Graphs Draw up a table of values using data or values calculated from a formula. Put the independent variable on the horizontal axis and the dependent variable on the vertical axis. Use suitable scales, covering the range of values. Draw a large graph using a sensible scale. 2 cm representing 1, 2, 5, 10, 20, 50, 100, 200, 500,…… Plot the points. Draw the best fit curve or straight line through them. Add title and labels (including units if there are any).