1 / 22

Area of a rectangle

Simple Areas. Area of a rectangle. Area of a right-angled triangle. www.mathsrevision.com. Area of composite shapes. Starter Questions. www.mathsrevision.com. 34 o. Area of a Rectangle. Learning Intention. Success Criteria. To be able to state area formula for a rectangle.

friedaw
Download Presentation

Area of a rectangle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Simple Areas Area of a rectangle Area of a right-angled triangle www.mathsrevision.com Area of composite shapes

  2. Starter Questions www.mathsrevision.com 34o www.mathsrevision.com

  3. Area of a Rectangle Learning Intention Success Criteria • To be able to state area formula for a rectangle. • 1. To come up with a formula • for the area of a • rectangle. • Apply formula correctly. • (showing working) www.mathsrevision.com • Use the formula to solve problems. • Answer containing • appropriate units www.mathsrevision.com

  4. General Jack’s Carpets Problem… www.mathsrevision.com Only £5 a square metre! How much for this one? ?

  5. Problem… 1m 1m = 1 square metre 6 m 6 square metres 3 m 6 square metres 6 square metres www.mathsrevision.com 3 rows of 6 squares = 3 x 6 = 18 square metres 18 x £5 = £90 How much for 18 square metres?

  6. Area of a rectangle 6 6 m length 3 3 m breadth www.mathsrevision.com 6 x 3 = 18 m² Area = length x breadth

  7. Example 1 Area = length x breadth A = l x b 11 cm A = 11 x 6 6 cm A = 66 cm² www.mathsrevision.com Find the area of the rectangle

  8. Example 2 Area = length x breadth A = l x b A = 12 x 12 A = 144 cm² www.mathsrevision.com 12 cm Find the area of the square

  9. Starter Questions www.mathsrevision.com 123o www.mathsrevision.com

  10. Area of A Right-Angled Triangle Learning Intention Success Criteria • Know area of a right-angled triangle formula • 1. Use the area of a rectangle formula to help us to come up with a formula to calculate the area of any right-angled triangle. 2. Use formula to work out area of triangle. www.mathsrevision.com 3. Show all working and units. www.mathsrevision.com

  11. Area of a right-angled triangle 4 cm 7 cm www.mathsrevision.com Area of rectangle = l x b = 7 x 4 = 28 cm² Area of triangle = ½ x Area of rectangle = ½ x 28 = 14 cm²

  12. Area of triangle Short cut 4 cm height base 7 cm www.mathsrevision.com Area of triangle = ½ x 7 x 4 = ½ x 28 = 14 cm² Area Δ = x base x height ½

  13. Example 1 Area Δ=½ x base x height AΔ =½ x b x h AΔ = ½ x 15 x 10 10 cm AΔ = 75 cm² www.mathsrevision.com 15 cm Find the area of the triangle

  14. Example 2 Area Δ=½ x base x height 8 cm AΔ =½ x b x h AΔ = ½ x 8 x 12 12 cm AΔ = 48 cm² www.mathsrevision.com Find the area of the triangle

  15. Area of a right-angled triangle Now try worksheet Exercise 1 www.mathsrevision.com

  16. 34o Starter Questions www.mathsrevision.com www.mathsrevision.com

  17. Made up of Simple shapes Area of a Composite Learning Intention Success Criteria • To be able to use knowledge gained so far to find the area of more complicated shapes.. • 1. To use knowledge to find area of more complicate shapes. www.mathsrevision.com • Show appropriate working. www.mathsrevision.com

  18. ? 13 cm Composite shapes 10 cm 6 cm ? 3 cm www.mathsrevision.com

  19. Composite shapes 10 cm 6 cm (1) 6 cm (2) ? 3 cm www.mathsrevision.com Area (1) = l x b = 10 x 6 = 60 cm² Area (2) = ½ x b x h = ½ x 3 x 6 = 9 cm² Area of shape = (1) + (2) = 60 + 9 = 69 cm²

  20. 15cm 11cm 6cm 3cm ? Example 1 l x b Area (1)= =15 x 8 = 120 cm² ? 8cm (1) Area (2) = l x b =9 x 3 = 27 cm² (2) (1) + (2) Area of shape = = 120 + 27 9cm = 147 cm² Find the area of the shape

  21. 12cm 10cm 20cm 6cm Example 2 l x b Area (1)= =20 x 12 = 240 cm² Area (2) = l x b =10 x 6 (2) = 60 cm² (1) – (2) Area of shape = = 240 -60 (1) = 180 cm² Find the area of the shape

  22. Composite shapes Now try worksheet Exercise 2 www.mathsrevision.com

More Related