True or False? To find the perimeter of a regular 2D shape you multiply the number of sides by the length of one side .

True. To find the perimeter of a regular 2D shape you multiply the number of sides by the length of one side .

What is the term used to describe the perimeter of a circle ?

The circumference of a circle is its perimeter .

How do you find the area of a compound shape ?

First split the shape into a combination of standard shapes . Find the area of each of the standard shapes and add them together.

True or False? An exam question will always tell you the specific measure or quantity that you need to calculate.

False. Sometimes the specific measure or quantity that you need to calculate will only be implied by the context of the question. E.g. When being asked to find the amount of paint required for a wall, you will need to calculate the area of the wall .

Define the term congruent .

Two shapes are congruent if they are identical in shape and size .

True or False? If one shape is an enlargement of the other, then they are congruent .

False. If one shape is an enlargement of the other, then they are not identical in size and so are not congruent .

True or False? You need to show that two shapes are facing in the same direction to prove congruence .

False. If the two shapes are identical in terms of shape and size then it does not matter which direction they are facing in.

IGCSEMathsEdexcelMaths A (Modular)Higher Unit 1FlashcardsShape, Space & MeasureArea & Perimeter

Area & Perimeter (Edexcel IGCSE Maths A (Modular))

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True or False?
To find the perimeter of a regular 2D shape you multiply the number of sides by the length of one side.

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True or False?
To find the perimeter of a regular 2D shape you multiply the number of sides by the length of one side.
True.
To find the perimeter of a regular 2D shape you multiply the number of sides by the length of one side.
True or False?
In a compound shape made up of two rectangles, the length of the two shorter sides opposite a longer side will add up to the same length as the longer side.
True.
In a compound shape made up of two rectangles, the length of the two shorter sides opposite a longer side will add up to the same length as the longer side.
What does a 'dash' on two or more sides of a shape in a diagram indicate?
All sides in a diagram that are annotated with a dash are of equal length.
E.g. A rectangle has two pairs of opposite sides of equal length.
What is the term used to describe the perimeter of a circle?
The circumference of a circle is its perimeter.
What is the formula for the area of a triangle?
The formula for the area of a triangle is $A = \frac{1}{2} b h$
Where:
- $A =$ area
- $b =$ base
- $h =$ perpendicular height
What is the formula for the area of a rectangle?
The formula for the area of a rectangle is $A = l w$
Where:
- $A =$ area
- $l =$ length
- $w =$ width
What is the formula for the area of a parallelogram?
The formula for the area of a parallelogram is $A = b h$
Where:
- $A =$ area
- $b =$ base
- $h =$ perpendicular height
What is the formula for the area of a trapezium?
The formula for the area of a trapezium is $A = \frac{1}{2} (a + b) h$
Where:
- $A =$ area
- $a$ and $b$ are the lengths of the two parallel sides
- $h =$ perpendicular height
True or False?
The formula for the area of a circle is $A = 2 π r$ .
False.
The formula for the area of a circle is $A = π r^{2}$
Where:
- $A =$ area
- $r =$ radius
How do you find the area of a compound shape?
First split the shape into a combination of standard shapes.
Find the area of each of the standard shapes and add them together.
True or False?
The area of a compound shape can only be found by adding areas.
False.
You may usually find the area of a compound shape by adding areas but sometimes it may be easier to find the area of a larger shape and subtract the area of another shape from it to find the area of the compound shape.
True or False?
An exam question will always tell you the specific measure or quantity that you need to calculate.
False.
Sometimes the specific measure or quantity that you need to calculate will only be implied by the context of the question.
E.g. When being asked to find the amount of paint required for a wall, you will need to calculate the area of the wall.
Define the term congruent.
Two shapes are congruent if they are identical in shape and size.
True or False?
If one shape is an enlargement of the other, then they are congruent.
False.
If one shape is an enlargement of the other, then they are not identical in size and so are not congruent.
True or False?
You need to show that two shapes are facing in the same direction to prove congruence.
False.
If the two shapes are identical in terms of shape and size then it does not matter which direction they are facing in.

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