3.5 Area of a Triangle
3.5 Area of a Triangle
3.5 Area of a Triangle
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Name:Date:<strong>3.5</strong> <strong>Area</strong> <strong>of</strong> a <strong>Triangle</strong>MathLinks 7, pp. 108–115Key Ideas ReviewUse the diagrams to help you fill in the blanks.1. Label the base and the height <strong>of</strong> each shape.2. a) The formula A × can be used to find the area <strong>of</strong> arectangle.b) The formula A _ b × h can be used to find the area <strong>of</strong> a triangle, whereb and h height.3. The <strong>of</strong> the triangle is always perpendicular to its base.Practise and Apply4. What is the area <strong>of</strong> each triangleshown on the centimetre grid?Show your thinking.b)a)36 MHR • Chapter 3: Geometry and Measurement
Name:Date:5. Draw each triangle on thecentimetre grid provided. Use theformula to determine the area <strong>of</strong>each triangle. Show your work,then check your answers usingestimation.a) b 5 cm, h 6 cm6. Calculate the area <strong>of</strong> each triangle.a)3 cm4 cmb) b 4 cm, h 8 cmb) b 7.5 m, h 6.8 mc) The base is 9.2 cm and the height istwice the length <strong>of</strong> the base.7. Determine the area <strong>of</strong> the whitetriangle. Show your work.7 mm30 mm8. Do both <strong>of</strong> these triangles have thesame area? Explain how you know.4.5 m5.2 m<strong>3.5</strong> <strong>Area</strong> <strong>of</strong> a <strong>Triangle</strong> • MHR 37
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