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PLANE SHAPES

CONTENT

  1. Measuring Perimeters
  2. Definition of Perimeter
  3. Perimeter of a Circle
  4. Perimeter of a Triangle
  5. Perimeter of a Regular/Irregular Polygon
  6. Perimeter of a Square
  7. Perimeter of Rectangles
  8. Perimeter of a Trapezium
  9. Perimeter of a Parallelogram

 

Measuring Perimeters

Definition of Perimeter

Perimeter is the outside boundary or edge of a plane shape. For example, the boundary fence of your school compound is its perimeter. We also use the word perimeter to mean the length of the boundary.

For example, if you take \(200\) paces to walk your school boundary, you could say its perimeter is \(200\) paces.

To find the perimeter of a shape, we add together the length of all sides of the shape.

Perimeter of plane shapes

What is the perimeter of the above shape?

Perimeter \(= 3 + 3 + 2 + 1 + 1 + 2\)

\(= 12 cm\)

 

Perimeter of a Circle

Perimeter of a circle

The perimeter of a circle is called its CIRCUMFERENCE \(= 2πr\)

Where \(r = radius\) of a circle and

\(π = \frac{22}{7}\) or \(3.14\).

Lesson tags: JSS1 Mathematics, JSS1 Mathematics Evaluation Questions, JSS1 Mathematics Evaluation Questions Third Term, JSS1 Mathematics Objective Questions, JSS1 Mathematics Objective Questions Third Term, JSS1 Mathematics Third Term, Mathematics Lesson Notes, Mathematics Objective Questions
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