More Lessons for Grade 9 Math

Math Worksheets

Videos, worksheets, solutions, and activities to help Algebra students learn how to solve word problems that involve angles.

How to solve word problems to find the measure of angles?

Example: There is half an apple pie left. You want to eat twice what your little brother eats but you also need to save a slice for your mum. You cut her a slice that is 30°. What is the measure of your piece of pie in degrees?

Example: The supplement of an angle is 18 less than 3 times the complement of an angle. What is the measure of the angle?

Students are asked to solve word problems that involve the triangle sum theorem. Students also learn the exterior angle theorem, which states that the exterior angle of a triangle is equal to the sum of the measures of the remote interior angles. Students are then asked to solve problems related to the exterior angle theorem using Algebra.

Example: The measure of the angles of a triangle are in the ratio 2:5:8. Find the measure of each angle.

Students are given word problems involving complementary and supplementary angles that require the student to set up an equation to find the measures of the given angles.

Example: Find the measures of two supplementary angles if three times the measure of one angle is 12 degrees less than the measure of the other.

You can use the Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem. Then click "Answer" to check your answer.