Angle Sums Worksheet
This worksheet helps Grade 6 students practice calculating angle sums in triangles and quadrilaterals.
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Angle Sums Practice
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Read each question carefully and calculate the missing angle. Show your work where indicated.
1. The sum of the interior angles of a triangle is always degrees.
2. The sum of the interior angles of a quadrilateral is always degrees.
3. Find the missing angle 'x' in the triangle below.
Show your work:
x = degrees
4. A triangle has two angles measuring 45° and 85°. What is the measure of the third angle?
5. Which of the following sets of angles could form a triangle?
30°, 60°, 80°
45°, 45°, 90°
50°, 70°, 70°
20°, 100°, 50°
6. Find the missing angle 'y' in the quadrilateral below.
Show your work:
y = degrees
7. A quadrilateral has three angles measuring 75°, 105°, and 90°. What is the measure of the fourth angle?
8. A quadrilateral can have four right angles.
True
False
9. A triangle can have two obtuse angles.
True
False