Finding the perimeter of polygons | Maths | Quizalize & Oak National Academy

Starter quiz

Perimeter is the distance ______ a 2D shape
- 'around' ✓
Replacing a letter in an expression with a value is known as ______
- formalisation
- equalisation
- subtraction
- substitution ✓
If $a$ = 10 and $b$ = 7, what is the value of the expression 2 $b$ + 2 $a$ ?
- '34' ✓
Substitute the value $y$ = 2 into the expression 3 $y$ $+$ 5 and evaluate the result
- '11' ✓
Izzy wants to add these values: 0.24, 0.5 and 17.3 together using column addition. Select the correct layout.
- Values right aligned
- Values left aligned
- Values centered
- Values aligned by the decimal point ✓
Evaluate 18.41 $+$ 16.7
- 3.448
- 3.511
- 34.48
- 35.11 ✓

Perimeter is the distance around a 2D shape. It can be calculated by ______ all of the edges together.
- 'summing' ✓
True or false? Number bonds can be used to calculate the perimeter more efficiently.
- True ✓
- False
Which of these formulas could not be used to calculate the perimeter ( $P$ ) of this square?
- $P = 4b$
- $P = 2b + 2b$
- $P = 3b + b$
- $P = b + b + b + b + b$ ✓
Complete the formula for the perimeter of this trapezium. $P =$ ______
- 'a + b + 2d' ✓
You can write a ______ to calculate the perimeter in an efficient way.
- 'formula' ✓
What is the mathematical name for the polygon whose perimeter ( $P$ ) can be calculated using the formula $P = t + r + 2w + y$ ?
- triangle
- quadrilateral
- pentagon ✓
- hexagon

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You can identify how to find the perimeter of polygons.
The perimeter of any polygon can be found by adding but this may be time consuming.
You can use a formula to find the perimeter of rectangle.
You can find and use a formula to find the perimeter of any regular polygon.

Pupils may not count all sides when calculating the perimeter due to the complexity of the shape.

Encourage pupils to mark the sides as they record the measurement to ensure they count every side length.

Polygon - A polygon is a flat (2D), closed figure made up of straight line segments.
Perimeter - The perimeter is the distance around a 2D shape.