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Finding the perimeter of a compound shape

How do you calculate the perimeter of a compound shape???

Sometimes the length of some sides of a compound shape is missing. In these cases you have to calculate it yourself. Here is an example:

How do you calculate the perimeter of a compound shape???

Compound shapes

Sometimes the shape is more complicated. In other cases you need to calculate 'missing' lengths and be particularly careful to include all the sides.

An L shape, with two sides measuring 2 cm, two sides measuring 3 cm, and two sides measuring 5 cm.

Perimeter = 2 + 2 + 3 + 3 + 5 + 5 = 20 cm

What do the terms

"perimeter" and compound shape mean???

How do you calculate the perimeter of a compound shape???

-Perimeter is the length of the outline of

a shape.

-A compound shape is a shape made up

of many simple shapes.

Objective and outcome

Obj: To be able to to understand how to

calculate the perimeter of a compound shape.

Outcome: Students will be able to calculate the perimeter of a compound shape.

Activity time!

http://www.bbc.co.uk/bitesize/ks3/maths/measures/perimeter/activity/

Plenary

Movie time!

http://www.bbc.co.uk/bitesize/quiz/q69792796

Thanks for watching!

Done by:

Larisa Fernandes and Maryam Abu Naim

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