Download presentation

1
**Yes you do need to write this.**

Area and Perimeter Yes you do need to write this.

2
**AREA The amount of space inside a 2-dimensional object.**

Measured in square units cm2, m2, mm2 Not to be confused with……

3
**Perimeter The distance around a two dimensional object.**

Measured in ‘normal’ units eg. cm, m, mm

4
**Some shapes have there own formulas for area**

Yes, you do need to draw these as well.

5
**Rectangle b a Area of a rectangle = ab (length x width)**

Perimeter = 2a + 2b = 2(a + b)

6
**No, you don’t have to try one.**

7
Parallelogram a b ‘a’ is the vertical height Parallelogram – quadrilateral with two pairs of parallel sides. Area = ab Can not work out the perimeter with the information given.

8
One to try 6cm 7cm Area = 6 x 7 =42 cm2

9
**Triangle Area = ½ bh ( ‘h’ is the vertical height)**

b b

10
**Trapezium (a quadrilateral with one pair of parallel sides)**

b Add together the parallel sides, divide by 2 and then multiply by the distance between them. Area = (a + b) x h 2

11
Example 2cm 10cm 5cm Area = (2 + 5) x 10 2 = 3.5 x 10 = 35 cm2

12
Compound Shapes These are shapes made by joining two or more shapes together. To find the area, find the area of the smaller shapes and add together.

13
Example. 7cm 10cm 8cm 3cm 7cm 2cm 8cm 3cm X Y

14
**Example. Area of X = 7 x 2 = 14 cm2 Area of Y = 3 x 8 = 24 cm2**

Total area = = 38 cm2 7cm 2cm 8cm 3cm X Y

15
**Last one. Find the shaded area**

10cm Area of square = 10 x 10 = 100 cm2 A. of triangle = ½ x 3 x 4 = 6 cm2 Shaded area = 100 – 6 = 94 cm2 3cm 3cm 4cm

16
**The only part left is circles (always a circle question)**

And then it’s volume.

Similar presentations

Presentation is loading. Please wait....

OK

8th Grade Math Unit 8 Review

8th Grade Math Unit 8 Review

© 2018 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google