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Module 6 Lesson 12
Conditions on Measurements
that Determine a Triangle
Homework: None
Do Now
Exit Ticket for Lesson 11
Take a ruler, a protractor, and a compass

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x + 3 > 5
3+ 5 > y
3, 4, 5, 6, 7
1800 Not make a triangle
900 yes a triangle
1900 Not a triangle

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We are given two sides and a non­
included angle

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Side AB and angle A, we don't know angle
B

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Two sides and a non included angle
One intersection

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All three examples were the two sides and a
non­included angle. The triangle with the
acute angle was not unique, the triangles
with right or obtuse angles was unique.
First angle was 30 Not Unique
Second 90 Unique
Third 120 Unique

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