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Perimeter Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Perimeter
The total distance around the outside of a 2D shape.
Perimeter of a rectangle
Add together twice the length and twice the width (2 × length + 2 × width).
Perimeter of a square
Multiply the length of one side by 4 (4 × side length).
Perimeter of a triangle
Add together the lengths of all three sides.
Perimeter of a regular polygon
Multiply the length of one side by the number of sides.
Perimeter of a circle (circumference)
Use the formula 2πr or πd, where r is the radius and d is the diameter.
Units for perimeter
Perimeter is measured in linear units such as mm, cm, m, or km.
Finding the perimeter of a compound shape
Add together the lengths of all the outer sides of the shape.
Perimeter of a semicircle
Use the formula πr + 2r, where r is the radius.
Perimeter of a shape with missing sides
Use given side lengths and properties of the shape (e.g., opposite sides of a rectangle are equal) to find the missing sides, then add all sides together.
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