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Area of a Triangle

Material Taken From: Mathematics for the international student Mathematical Studies SL Mal Coad , Glen Whiffen , John Owen, Robert Haese , Sandra Haese and Mark Bruce Haese and Haese Publications, 2004. Chapter 10 – Section F: Area of Triangles. Area of a Triangle.

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Area of a Triangle

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  1. Material Taken From:Mathematicsfor the international student Mathematical Studies SLMal Coad, Glen Whiffen, John Owen, Robert Haese, Sandra Haese and Mark BruceHaese and Haese Publications, 2004

  2. Chapter 10 – Section F: Area of Triangles Area of a Triangle • If we know the base & height, we can find the area: A = ½ bh

  3. Area of a Triangle • What if we don’t know the height?

  4. Area of a Triangle A b h B C a

  5. Area of a Triangle Area = ½ absinC = ½ bcsinA = ½ ac sinB

  6. 1) Find the area of triangle ABC

  7. 2) The diagram shows a triangular children’s playground. Find the area of the playground.

  8. 3) If the area of a triangle is 1782 m2. Find the included angle if the two side lengths measure 103 m and 58 m.

  9. Homework • 10F, page 338 #1, 2, 3, 4

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