Area and Perimeter.pptxxxxxxxxxxxxxxxxxxx

Geometría

1. Area and Perimeter LO: To find compound areas using rectangles 7-Nov-18 Starter: Find the area and perimeter of the following shapes: Extension: A rectangle has an area of 24cm 2 . How many different rectangles can you find with that area? What rectangle has the greatest perimeter? Which has the smallest perimeter? Can you find any triangles with that area?

2. 7-Nov-18 LO: To find compound areas using rectangles CARD SORT Work in pairs to match together the shapes, areas and perimeters Do working out in your books if necessary. Once finished, ask for the flags extension!

3. Area and Perimeter LO: To find areas of triangles, parallelograms and trapeziums. 7-Nov-18 STARTER Match the area, shape and perimeter. There will be a rectangle missing, draw it!

4. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. Area of a triangle How could we calculate the area of this Triangle? 8cm 5cm

5. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. Area of a triangle Base x Perpendicular Height 2 3cm 8cm 9cm B x H 2 3 x 8 2 12cm 2 = = 11m 5m B x H 2 5 x 11 2 27.5m 2 = =

6. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. Area of a parallelogram How could we calculate the area of this Parallelogram? 9cm 5cm 4cm

7. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. Area of a parallelogram Base x Perpendicular Height 13cm 6cm 7cm B x H 13 x 6 78cm 2 = = B x H 2 x 5 10m 2 = = 2m 5m 7m

8. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. 8cm 5cm 6cm 8cm 5cm Copy the original Trapezium Flip it Upside down Place it alongside the original one It is now just a parallelogram! Area of the Parallelogram B x H 13 x 6 78cm 2 Area of the Trapezium 78 ÷ 2 = 39cm 2 8cm 5cm 8cm 5cm Area of a trapezium

9. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. Area of a trapezium a b h (a + b) x h 2 a and b are the parallel sides h is the perpendicular height a b h

10. 7-Nov-18 LO: To find areas of triangles, parallelograms and trapeziums. Area of a trapezium a b h (a + b ) x h 2 h Area of a parallelogram b x h h Area of a triangle b x h 2 b b b PRACTISE – You can use a calculator Page 377 Exercise 8 Questions 1, 3, 4, 5, 8 Page 380 Exercise 9 Questions 1, 2, 3 EXTENSION: Continue Flags worksheet h is always the perpendicular height (la altura ) h

11. ANSWERS Flags !