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# Common Core Standard 8.G.A.5 Questions

Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angle-angle criterion for similarity of triangles. For example, arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give an argument in terms of transversals why this is so.

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In the figure below, if angle 1 is $100deg$, what is the measure of angle 5?
1. $80deg$
2. $100deg$
3. $110deg$
4. $140deg$
Grade 8 Points, Lines, and Planes CCSS: 8.G.A.5
Which set of angles is an example of corresponding angles?
1. $ang1 and ang2$
2. $ang4 and ang5$
3. $ang6 and ang8$
4. $ang3 and ang7$
Grade 8 Points, Lines, and Planes CCSS: 8.G.A.5
Which of the following correctly classifies the relationship between $ang4$ and $ang5$?
1. alternate interior angles
2. same-side interior angles
3. corresponding angles
4. vertical angles
The exterior angle of a triangle is equal to                                                    .
1. the value of its adjacent angle
2. the sum of its opposite interior angles
3. the product of its opposite interior angles
4. the difference between its opposite interior angles
What is the sum of the exterior angles of a triangle?
1. $180deg$
2. $270deg$
3. $360deg$
4. $540deg$
Which of the following statements about the exterior angle of a triangle is true?
1. it is always equal to the value of its adjacent angle
2. it is always larger than either opposite interior angle
3. it is always larger than the sum of its opposite interior angles
4. it is always equal to the sum of the interior angles of the triangle
Grade 8 Points, Lines, and Planes CCSS: 8.G.A.5
Grade 8 Points, Lines, and Planes CCSS: 8.G.A.5
If $ang2$ is a right angle and line m is parallel to line k, then which statement is correct?
1. $ang6$ must equal $90deg$
2. $ang6$ may equal $90deg$
3. $ang6$ cannot equal $90deg$
4. Not enough information to determine
1. $30deg$
2. $60deg$
3. $120deg$
4. $180deg$