Area of composite shapes

L9.3: Area of composite shapes

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​Learning objectives

• find the areas of composite figures where two or more shapes have been composed together,

• find the areas of composite figures where one or more shape is taken out of another shape.

​Lesson prerequisites

• finding areas of 2D shapes:

  • squares,

  • rectangles,

  • parallelograms,

  • triangles,

  • trapezoids,

  • circles.

    Note The unit of measurement of any area is always unit²

Area of shapes

A= π*r²

​A= s*s
A= s²

​A= L*W

​A= 1/2 b*h

​s

​s

b

h

L

w

​r

Let's review

https://wordwall.net/resource/10290044/math/area-composite-figures-review

Multiple Choice

What operation do you do when you remove a shape ?

• Cut off so subtract area

  (Subtraction)

• Add on more area( Addition)

• Nothing

• Divide the area by the factor (divison)

​Composite shapes

https://quizizz.com/join?gc=72891871

https://quizizz.com/join?gc=81455423

Elite

Proffesional

Standard

​Homework

Using A4 paper,
Create a custom composite shape of combining two shapes minimum,
Measure the area using a ruler and determine the area

Materials needed:
-Paper (or cardboard)
-Ruler
- Pencil