Triangle Sum Theorem Worksheet
A Grade 11 math worksheet focusing on the Triangle Sum Theorem, including various problem types to reinforce understanding of triangle angle properties.
Includes
Standards
Topics
Triangle Sum Theorem Practice
Name:
Date:
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Read each question carefully and answer to the best of your ability. Show all your work for full credit.
1. What is the Triangle Sum Theorem? Explain it in your own words.
2. In triangle ABC, if angle A = 45° and angle B = 60°, what is the measure of angle C?
65°
75°
85°
95°
3. Find the value of x in the triangle below.
4. The sum of the interior angles of any triangle is always degrees.
5. An exterior angle of a triangle is equal to the sum of the two interior angles.
6. A triangle can have two obtuse angles.
True
False
7. In triangle DEF, the measure of angle D is (2x + 10)°, angle E is (3x - 20)°, and angle F is (x + 30)°. Find the value of x and the measure of each angle.
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