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area of shapes.pptx. Finding the area of 2d shapes
- 1. Finding the Area Howdo I find the area of 2D shapes? HAVE YOU NOT GOT OFF THIS SLIDE YET? COME ON! GET MOVING GUYS!
- 2. Squares, Rectangles andParallelograms Multiply the width, by the height Make sure all lengths have the same unit, convert if necessary 0.5m 7cm 10cm 10cm 5cm 7cm Don’t be tricked by useless information 7 x 50 = 350cm2 10 x 10 = 100cm2 5 x 10 = 50cm2 50cm
- 3. What would happenif we halved these shapes The area of a triangle is half the area of the big shape, so: Area of triangle = base x height ÷ 2
- 4. Remember the formulasays HEIGHT not side 10cm 15cm 25cm 10 x 25 = 250 250 ÷ 2 = 125cm2
- 5. Area of Trapeziums Youcan find the area of a trapezium by using the formula- (a + b) ÷2 x h 5cm 10cm 12cm You can find the area of a trapezium by using the formula- (12 + 10) ÷2 x 5 = 55cm2
- 6. Area of Trapeziums Youcan find the area of a trapezium by using the formula- (a + b) ÷2 x h 4cm 7cm 13cm You can find the area of a trapezium by using the formula- (7 + 13) ÷2 x 4 = 40cm2
- 7. Area of Trapeziums Youcan find the area of a trapezium by using the formula- (a + b) ÷2 x h 9cm 2cm 8cm You can find the area of a trapezium by using the formula- (2 + 8) ÷2 x 9 = 45cm2
- 8. 14cm 10cm 7cm 8cm 12cm 15cm 14cm 30cm 15cm 11cm 9cm 20cm 12cm 11cm 12cm 16cm 14cm 9cm 12cm 12cm 18cm 20cm 12cm 14cm 8cm 25cm 12cm 15cm 14cm 16cm 15cm 1 2 3 4 5 6 7 8 9 10 11 12 13 Answers: 1) 140cm2 2)56cm2 3) 180cm2 4) 192cm2 5) 132cm2 6) 240cm2 7) 330cm2 8) 72cm2 9) 72cm2 10)180cm2 11)140cm2 12)240cm2 13)225cm2
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