More Related Content
![Mathematics[1].pdf](https://cdn.slidesharecdn.com/ss_thumbnails/mathematics1-230423074819-7919d7a5-thumbnail.jpg?width=560&fit=bounds)
Similar to Chapter 11 Perimeter and Area for grade 7.pptx (20)
Chapter 11 Perimeter and Area for grade 7.pptx
- 1. Geometry: Perimeter and Area Image Source: https://www.tes.com/lessons/nvcbw0GrqsSIsg/shapes
- 2. Geometry is about shapes and their properties. Plane Geometry is about two dimensional shapes (Flat shapes or 2D Shapes) like lines, circles squares, rectangles,triangles...
- 3. Geometry is about shapes and their properties. Solid Geometry is about three dimensional shapes (Shapes with volum or 3D Shapes) like cubes, prisms, cylinders and spheres.
- 4. Properties of two dimensional (flat) shapes Flat shapes have lines called SIDES How many sides has it got?
- 5. Properties of two dimensional (flat) shapes The point where two sides meet or intersect are called Corners or vertexs How many corners has it got?
- 6. Properties of two dimensional (flat) shapes: Square A Square is a two dimensional shape with 4 equal sides. A square has got 4 corners. A square has got 4 right angles (90°) Means right angle Means equal side
- 7. Properties of two dimensional (flat) shapes: Rectangle A Rectangle is a flat shape with 4 sides. A rectangle has got 4 corners. A rectangle has got 4 right angles (90°) Means right angle Means equal side Means equal side
- 8. Properties of two dimensional (flat) shapes: Rectangle A Rectangle is a flat shape with 4 sides. Are the 4 sides equal? Yes or no? What is the difference?
- 9. Properties of two dimensional (flat) shapes: Rectangle This side is shorter Are the 4 sides equal? No What is the difference? They are not equal in lenght This side is longer This side is shorter This side is longer
- 10. Properties of two dimensional (flat) shapes: Rectangle A Rectangle has got parallel opposite sides. The parallel opposite sides are equal in lenght.
- 11. Properties of two dimensional (flat) shapes: Rectangle and Square
- 12. Properties of two dimensional (flat) shapes: Worksheet 1 help. Questions 6 and 7. Write: side, angle, corner on the right place.
- 13. Perimeter of a Square The Perimeter is the distance around the edge. The Perimeter is 4 times the side length: a+a+a+a = 4a 4xa = 4a
- 14. Perimeter of a Rectangle In a rectangle, the Perimeter is the addition of the 4 sides: h + h + w + w = perimeter To calculate the perimeter, you can add 2 times the width plus 2 times the height: 2w + 2h = perimeter
- 15. Calculating the Perimeter of a Square Example: A square has a width of 8 cm, what is its Perimeter? w = 8 cm w = 8 cm w = 8 cm w = 8 cm 8 + 8 + 8 + 8 = 32 cm or 4 X 8 = 32 cm
- 16. Area of a Square The area of a square is one side times one side: a x a = area
- 17. Area of a Rectangle The Area is the long side (width/w) times the short side (height/h): Area = w (long side) × h (short side)
- 18. Revision Match A flat shape with 4 equals sides and 4 right angles. rectangle A flat shape where opposite sides are parallel and of equal lenght. square
- 19. Revision: Calculating the Area of a Square Example: A square has a width of 8 cm, what is its Area? w = 8 cm w = 8 cm w = 8 cm w = 8 cm
- 20. Revision: Calculating the Area of a Square w = 8 cm w = 8 cm w = 8 cm w = 8 cm Example: A square has a width of 8 cm, what is its Area? 8 x 8 = 16 cm2
- 21. Revision: Calculating the Perimeter of a Rectangle Example: A rectangle has a width of 12 cm, and a height of 5 cm, what is its Perimeter? h = 5 cm w = 12 cm h = 5 cm w = 12 cm
- 22. Revision: Calculating the Perimeter of a Rectangle h = 5 cm Example: A rectangle has a width of 12 cm, and a height of 5 cm, what is its Perimeter? 2 × 12 cm = 24 cm plus 2 x 5 cm = 10 cm 24 cm + 10 cm = 34 cm w = 12 cm h = 5 cm w = 12 cm
- 23. Revision: Calculating the Area of a Rectangle Example: A rectangle has a width of 12 cm, and a height of 5 cm, what is its Area? h = 5 cm w = 12 cm h = 5 cm w = 12 cm
- 24. Revision: Calculating the Area of a Rectangle Example: A rectangle has a width of 12 cm, and a height of 5 cm, what is its Area? 12 cm × 5 cm = 60 cm2 h = 5 cm w = 12 cm h = 5 cm w = 12 cm
- 25. Extension 1 The area of a square is 25 cm2. How long is each side? 2 The perimeter of a rectangle is 22 cm. Find the possible lenght of each side and draw it using the real mesure. 3 The area of a rectangle is 36 m2. How long is the width? How long is the height?
- 26. Width = w = ...... cm Width = w = ....... cm Height = h = ....... cm Height = h = ....... cm