8th Grade Angles in Triangles and Parallel Lines Quiz: 10 Questions with Explanations

8th Grade math quiz: Angles in Triangles and Parallel Lines – Maths PDF

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This grade 8 angle relationships quiz for 8th Grade covers angles in triangles and parallel lines (Common Core 8.G.A.5), with a free PDF to print.

Pick the best answer for each of the 10 questions about angle relationships in triangles and with parallel lines cut by a transversal (Common Core 8.G.A.5). Read each question carefully, then read the explanation to learn from any mistake.

Grade 8 · Common Core State Standards: 8.G.A.5

Grade 8 angle relationships quiz: 10 questions

Question 1

Two angles of a triangle are \(35^{\circ}\) and \(80^{\circ}\). What is the third?

Question 2

A triangle. Not drawn to scale.

What is the measure of the exterior angle at the right vertex?

Question 3

An exterior angle is \(140^{\circ}\) and one remote interior angle is \(90^{\circ}\). What is the other remote interior angle?

Question 4

Lines j and k are parallel.

Lines \(j\) and \(k\) are parallel. What is the angle marked ?

Question 5

Co-interior angles on parallel lines add up to

Question 6

Vertical angles are

Question 7

A transversal crosses lines j and k.

What is the measure of the angle marked ?, which forms a linear pair with the 110° angle?

Question 8

Triangles with angles 30, 60, 90 and 60, 90, 30 are

Question 9

If \(x + 2x + 3x = 180\), what is the smallest angle?

Question 10

Can a triangle have angles \(100^{\circ}\), \(50^{\circ}\) and \(40^{\circ}\)?

Remember

Angles of a triangle: \(a + b + c = 180^{\circ}\).
Exterior angle = sum of the two remote interior angles.
Parallel lines: corresponding and alternate interior angles are equal.
Co-interior angles add to \(180^{\circ}\); vertical angles are equal.
Two equal angles are enough to show two triangles are similar (AA).

How to use this grade 8 angle relationships quiz

Answer each question, read the explanation that appears, and keep track of your score. A score of 8 out of 10 or more means you are ready for the test.

Download the grade 8 angle relationships quiz as a PDF with the button below and keep it with your notes.

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