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Published byFaith Caldwell Modified over 4 years ago

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Estimate the angle? Now measure the angle? 150º

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Estimate the angle? Now measure the angle? 215º

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**Constructing triangles**

Aim: To construct triangles using a protractor. 60º

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**Draw a triangle with one side 6cm and angles at each end of 30º and 70º.**

Mark 70º Mark 30º 6 cm

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**Draw a triangle with a side 12 cm and side 9 cm **

with an angle of 75º between them. Mark 75º 12 cm

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**Three ways to construct triangles.**

When constructing triangle we need a combination of angles of lengths. We can construct triangles with a compass if we have the lengths of the 3 sides (S S S). We can construct triangle using a protractor if we have the length of 1 side and the measurement of 2 angles ( A S A ). We can construct triangle using a protractor if we have the length of 2 sides and the measurement of 1 angles ( S A S ). Note: To construct triangles, we need to know the length of at least 1 side plus 2 other pieces of information.

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Task and Homework Construct the following triangle: S S S Triangles 5cm 7cm 9cm 6cm 6 cm 4cm 10cm 8cm 7cm 6cm 8cm 10cm 7cm 7 cm 7 cm A S A Triangles 40º 7cm 50º 45º 6 cm 45º 20º 8cm 100º 60º 8cm 60º 110º 7 cm º A S A Triangles 7cm 50º 4 cm 6 cm 45º 6 cm 8cm 100º 6 cm 8cm 60º 8 cm 7 cm º 6 cm

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Warm -up Copy the pictures, find x and the measure of each angle. 2xx 60 1. 4x X+15 2. Front reflection: If 2 triangles have all corresponding angles congruent.

Warm -up Copy the pictures, find x and the measure of each angle. 2xx 60 1. 4x X+15 2. Front reflection: If 2 triangles have all corresponding angles congruent.

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