Grade 8 | Unit 1 | Lesson 16: Parallel Lines and the Angles in a Triangle | Practice Problems

For each triangle, find the measure of the missing angle. Description:

Four triangles. Figure 3 is triangle J L K. Angle J is labeled 20 degrees. Angle K is labeled 72 degrees. Figure 4 is triangle I G H. Angle G is labeled 56 degrees. Angle H is labeled 89 degrees. Figure 1 is triangle A B C. Angle A is labeled 28 degrees. Angle B is labeled 128 degrees. Figure 2 is triangle D E F. Angle E is labeled 122 degrees. Angle F is labeled 38 degrees.

What is the measure of the missing angle in triangle A B C?

• 24 degrees

• 30 degrees

• 36 degrees

What is the measure of the missing angle in triangle D E F?

• 20 degrees

• 25 degrees

• 35 degrees

What is the measure of the missing angle in triangle J L K?

• 88 degrees

• 80 degrees

• 75 degrees

What is the measure of the missing angle in triangle I G H?

• 35 degrees

• 40 degrees

• 45 degrees

Is there a triangle with two right angles? Explain your reasoning.