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Triangles Lesson
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Triangle
3 sided polygon totaling 180° Obtuse
Greater than 90° and less than 180° Acute
Less than 90° Right
Exactly 90° Degrees
the unit of measurement used to measure angles 180°
The sum of all angles of any triangle Congruent
same size, same shape, equal in length or measure Equilateral Triangle
All sides congruent Isoceles Triangle
2 sides congruent Scalene
No sides congruent or equal in length

TRIANGLES QUIZ

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1. In your own words, define a triangle.

2. An isosceles triangle has

3. An acute triangle has

4. A scalene triangle has ___ equal sides.

5. A triangle with angle measures 40°, 90°, and 50° is a(n) _____________ triangle.

6. A triangle with a 104° angle is a(n) _______________ triangle.

7. A triangle with sides lengths: 4.5 cm, 4.5 cm, and 8 cm is a(n) ___________ triangle.

8. What is the measure of the missing angle?

9. A triangle has 2 sides that are congruent. One angle is 80° and another angle is 80°.
What type of triangle is it and what is the measure of the third angle?

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