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 .

Area is the amount of space inside the perimeter of a 2D shape. It is worked out from lengths in two dimensions , which is what separates it from a perimeter.

A shape is drawn on a square grid. How do you work out its area by counting squares?

Count all the whole squares inside the shape, then pair up the part-squares to make further whole ones. Multiply the total by the area that one square represents, which the grid will tell you.

True or False? In a right-angled triangle , the two sides that meet at the right angle can be used as the base and the perpendicular height.

True. Each of those two sides is perpendicular to the other, so whichever one you take as the base, the other is already the perpendicular height.

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 .

IGCSEMathsCambridge (CIE)CoreFlashcardsLengths, Areas & VolumesArea & Perimeter

Area & Perimeter (Cambridge (CIE) IGCSE Maths: Core): Flashcards

Exam code: 0580 & 0980

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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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Cards in this collection (14)

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.
Define area.
Area is the amount of space inside the perimeter of a 2D shape.
It is worked out from lengths in two dimensions, which is what separates it from a perimeter.
A shape is drawn on a square grid. How do you work out its area by counting squares?
Count all the whole squares inside the shape, then pair up the part-squares to make further whole ones.
Multiply the total by the area that one square represents, which the grid will tell you.
Complete the formula for the area, $A$ , of a trapezium with parallel sides $a$ and $b$ and perpendicular height $h$ . The first gap is the denominator of the fraction.
$A = \frac{1}{______} (a + b)______$
The completed formula is:
$A = \frac{1}{2} (a + b) h$
Add the two parallel sides, multiply by the perpendicular height, then halve.
What is the formula for the area of a rectangle?
The area of a rectangle is its length multiplied by its width:
$A = l \times w$
The length and the width are two sides that meet at a corner, not a pair of opposite sides.
True or False?
In a right-angled triangle, the two sides that meet at the right angle can be used as the base and the perpendicular height.
True.
Each of those two sides is perpendicular to the other, so whichever one you take as the base, the other is already the perpendicular height.
How do you find the area of a parallelogram, and which height must you use?
Multiply the base by the perpendicular height:
$A = b h$
The perpendicular height is the distance between the base and the side opposite it, so it is not the length of a sloping side.
Why is an area measured in units such as ${cm}^{2}$ rather than $cm$ ?
Because an area is found by multiplying two lengths, so the unit is multiplied by itself: $cm \times cm = {cm}^{2}$ .
A perimeter is a single length and so stays in $cm$ .
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.

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