STARTERS Find the area of Trapezium = 750 Rectangle = 1000

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Presentation transcript:

STARTERS Find the area of Trapezium = 750 Rectangle = 1000 Half Circle = 628.3 Area = 750 + 1000 - 628.3 = 1121.7 cm2

Note 6: Finding missing parts of shapes To find missing sides of shapes, rearrange the formulas . Example 1: The area of the triangle is 135m2. Calculate the height of the triangle. Area = ½  base  height 135 = ½  18  x 135 = 9x x = 15m

Example 2: Calculate the radius of a circle with an area of 65cm2. Area = π  r2 65 = π  r2 r2 = 65/π r = √65/π = 4.5 cm

EXERCISES: Each of these shapes has an area of 60cm2. Calculate the lengths marked x. 10cm 15cm 2.5cm √60 =7.7cm

Calculate the radii of these circles with the given areas. EXERCISES: Calculate the radii of these circles with the given areas. 18.7 cm 3.87 m 1.38 cm 0.798 km

Radius Diameter circumference EXERCISES: A circle has an area of 39.47m2. Calculate: Radius Diameter circumference 3.55 m 7.09 m 22.27 m