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 .

Define the area of a 2D shape.

Area is the amount of space inside the shape's perimeter. It is worked out from lengths in two dimensions, which is why every area formula multiplies two lengths together.

How do you find the area of a shape on a square grid when some squares are only partly covered?

Count the whole squares first, then pair up the part-covered squares to make further whole ones. Multiply the total number of squares by the area that one square represents.

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 .

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Area & Perimeter (Edexcel GCSE Maths: Foundation): Flashcards

Exam code: 1MA1

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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 the area of a 2D shape.
Area is the amount of space inside the shape's perimeter.
It is worked out from lengths in two dimensions, which is why every area formula multiplies two lengths together.
How do you find the area of a shape on a square grid when some squares are only partly covered?
Count the whole squares first, then pair up the part-covered squares to make further whole ones.
Multiply the total number of squares by the area that one square represents.
A trapezium has parallel sides of $30$ cm and $15$ cm, and a perpendicular height of $20$ cm. Complete the working:
$A = \frac{1}{2} \times______\times 20 =______$
The completed working is:
$A = \frac{1}{2} \times 45 \times 20 = 450$
The two parallel sides are added first, giving $30 + 15 = 45$ , and the answer is $450$ cm $^{2}$ .
What is the formula for the area of a triangle, and what must the height be?
$A = \frac{1}{2} b h$ , half the base multiplied by the height.
The $h$ must be the perpendicular height, measured at right angles to the base, and it may not be the length of any side of the triangle.
True or False?
To find the area of a parallelogram you multiply the base by the length of the sloping side.
False.
The formula is $A = b h$ , where $h$ is the perpendicular height.
That height is the distance between the base and the side opposite it, which is shorter than the sloping side.
What is the formula for the area of a trapezium?
$A = \frac{1}{2} (a + b) h$ , where $a$ and $b$ are the two parallel sides.
Add the parallel sides, multiply by the distance between them, then halve.
What is the formula for the area of a rectangle?
$A = l \times w$ , the length multiplied by the width.
A rectangle is the one shape here that needs no separate perpendicular height, because its length and width are already at right angles to each other.
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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