Grade 9 Geometry: Angle Sums
This worksheet covers fundamental concepts of angle sums, including angles on a straight line, angles around a point, and interior angles of polygons, suitable for Grade 9 geometry students.
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Grade 9 Geometry: Angle Sums
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Date:
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Read each question carefully and answer to the best of your ability. Show all your work where applicable.
1. The sum of angles on a straight line is always equal to degrees.
2. Find the value of x in the diagram above. x =
3. What is the sum of angles around a central point?
4. Calculate the value of y in the diagram above.
5. What is the sum of the interior angles of a quadrilateral?
180°
360°
540°
720°
6. A regular hexagon has an interior angle sum of:
180°
360°
540°
720°
7. A triangle has angles measuring 45° and 65°. What is the measure of the third angle?
8. Find the value of z in the triangle shown above.
9. The sum of the exterior angles of any convex polygon is 360°.
True
False
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