Exterior Angle of a Triangle
This worksheet focuses on understanding and calculating the exterior angles of triangles for 7th-grade students.
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Exterior Angle of a Triangle
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Read each question carefully and answer to the best of your ability. Remember that the exterior angle of a triangle is equal to the sum of the two opposite interior angles.
1. What is the measure of the exterior angle 'x' in the triangle below?
50°
110°
130°
180°
2. If two interior angles of a triangle are 45° and 80°, what is the measure of the exterior angle adjacent to the third interior angle?
55°
125°
135°
180°
3. The exterior angle of a triangle is equal to the sum of the two interior angles.
4. If an interior angle of a triangle is 70°, its adjacent exterior angle is .
5. A triangle has interior angles measuring 30°, 70°, and 80°. Calculate the measure of each exterior angle of the triangle.
6. Draw a triangle and label its interior angles as A, B, and C. Then, extend one side to show an exterior angle and label it X. Explain the relationship between angle X and angles A, B, and C.
7. The sum of an interior angle and its adjacent exterior angle is always 90°.
True
False
8. An exterior angle of a triangle can be acute.
True
False
9. In the figure below, find the value of 'y'.