We have not included all shapes, and we have not covered Surface Area. We plan to do these in a future post.
The information presented here is invaluable to students revising Measurement.
Perimeter is the total length around the OUTSIDE of any shape. It is given the special name of “Circumference” when dealing with circular shapes.
The following formulas give the Areas of common shapes such as Squares, Rectangles, Parallelograms, Triangles, Trapeziums, and Circles.
Area of a Rhombus
A Rhombus is a Parallelogram that has all four sides equal. We can work out its area using Base x Height, but we can also work out the same area by multiplying the two internal diagonals together, and dividing by 2.
Answers to Rhombus Questions:
Q1. 418 sq cm, 41600 sq mm, 0.0006 sq m.
Q2. 91 sq cm
Q3. (1000×2) / 10 = 200mm.
Q4. (120×2) / 30 = 8m.
Area of a Kite
A Kite is a similar shape to a Rhombus, and its area is obtained by multiplying together its diagonals.
Summary of Area Formulas
Here is a set of formulas that are used in mathematics for finding areas.
The following SlideShare Powerpoint contains all of the above formulas as well as Measurement Conversions and Volumes of Prisms.
Click the bottom right hand corner full screen button to view as a presentation.
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This PowerPoint is the same as the one shown in the Slideshare Presentation in this post, but has sharper quality images on it. It can be printed out as slides in color on A4 paper, and then enlarged on a color photocopier to A3 and laminated to create mini wall posters for a Math Classroom.