12.01 Properties of shapes
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Can you identify a 2D shape using its basic properties?
What is the name of the shape in the picture below?
Triangle
ARectangle
B
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This video will show you how to work out the name of a 2D shape based on its properties.
A polygon is a 2D shape that is made of straight lines and is closed.
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Question 1
Which of the following shapes are rectangles? Choose all correct answers.
A
B
C
D
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This image shows the different categories of quadrilaterals and their properties. A pair of angled markings means two opposite sides are parallel. If any two sides have the same straight markings then they have the same length.
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Question 2
Select all parallelograms:
A four-sided shape has two pairs of opposite sides marked with arrowheads. One pair is marked with single arrowheads, and the other pair is marked with double arrowheads.
A
A four-sided convex polygon has four sides of unequal lengths. All sides are unmarked. B
A four-sided shape has two pairs of adjacent sides marked with tick marks. One pair is marked with single tick marks, and the other pair is marked with double tick marks.
C
A four-sided concave polygon has four sides of unequal lengths. All sides are unmarked. D
A four-sided shape has two pairs of adjacent sides marked with tick marks. One pair is marked with single tick marks, and the other pair is marked with double tick marks.
E
A four-sided shape has two pairs of opposite sides marked with arrowheads. One pair is marked with single arrowheads, and the other pair is marked with double arrowheads.
F
The features of 2D shapes help us know which shape we are looking at, such as:
- the number of sides, including any that are equal or parallel
- the number of angles, including any that are right angles