Calculate the area of compound rectilinear shapes
I can calculate the area of compound rectilinear shapes.
Calculate the area of compound rectilinear shapes
I can calculate the area of compound rectilinear shapes.
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Lesson details
Key learning points
- Use addition and subtraction to calculate missing side lengths in compound rectilinear shapes.
- Identify two different lengths which total another side length in a compound rectilinear shape.
- Use knowledge of the area of a rectangle to calculate the area of shapes made from two rectangles.
Keywords
Compound - A shape made up of two or more other shapes is known as compound.
Rectilinear - A shape where all angles composed of right angles is called a rectilinear shape.
Common misconception
Calculating the length of a side when the overall dimension and part dimensions are known and understanding when a part of the overall dimension is needed to calculate part of the area.
Look at shapes with missing dimensions and discussing that the overall length and width of a compound rectilinear shape is the total of the shorter side lengths in a particular direction. This allows missing or overall dimensions to be calculated.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Match the start and end of the sentences to describe the shapes correctly.
is a rectilinear shape.
is a compound shape.
Q2.The area of a compound shape made of two rectangles can be calculated by the area of each rectangle.
Q3.What is the total area of this compound rectilinear shape? m².
Q4.Which times table fact is needed to calculate the missing area in this rectilinear shape?
Q5.Which multiplications are needed to calculate the area of the shape?
Q6.Calculate the area of this rectilinear shape? cm²
Assessment exit quiz
6 Questions
Q1.Match the parts of the sentences correctly.
has four right angles.
is made up of two or more shapes.
has angles that are all right angles.
is made up of two or more rectangles.
Q2.We can calculate the area of compound rectilinear shapes by splitting it into .
Q3.Look at this compound rectilinear shape. Which statements are true?
Q4.Look at this shape. The total length of sides a and d is cm.
Q5.What is the missing length 'a' on this shape? cm
Q6.Calculate the area of this compound rectilinear shape. A = cm²
