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Published byMarcus Quinn Modified over 9 years ago
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Learning Objective Identify triangles using their sides
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You already know… A triangle has 3 sides.
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Equilateral triangle ALL sides are equal 7 7 7
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Isosceles Triangle 2 sides are equal 8 8 6
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Scalene Triangle NONE of the sides are the same length 8 7 6
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Examples Examples
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Non-Examples
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Think… What would be the name of this triangle? 10 13 15
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Think… How do you know this is a scalene triangle? 10 13 15
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Importance It will be on the district test It can help you build things
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Step 1 Look at the length of the sides.
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Step 2 Ask are all sides equal? Yes NO equilateral Keep Looking!!!
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Step 3 Ask are 2 sides equal? Yes NO isosceles Keep Looking!
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Step 4 Ask are NO sides equal? Yes scalene
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Model: 14 20 16 Scalene Triangle
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Guided Practice 14 14 12 Isosceles
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Guided Practice 1015 18 Guided Practice 1015 18 Scalene
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Guided Practice 11 11 11 Equilateral
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Closure Why is identifying triangles by their sides important? How did we identify triangles?
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