Topics
3. Transformations & Congruence
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United States of AmericaUT
Grade 8

3.06 Angles in triangles

Lesson
Practice

Interactive practice questions

Select the acute triangle:

A triangle with no tick marks on its sides, indicating that no sides are equal in length. One corner of the triangle has box drawn inside it, indicating a 90 degrees angle.

A

A triangle with no tick marks on its sides, indicating that no sides are equal in length. One of the interior angles measures more than 90° degrees and the other two is less than 90° degrees.

B

A triangle with no tick marks on its sides, indicating that no sides are equal in length. All angles appear to be less than 90 degrees.

C

A triangle with no tick marks on its sides, indicating that no sides are equal in length. One of the interior angles measures more than 90° degrees and the other two is less than 90° degrees.

D
Easy
< 1min

Select the obtuse triangle:

Easy
< 1min

Select the right-angled triangle:

Easy
< 1min

Select the isosceles triangle:

Easy
< 1min
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Outcomes

8.G.5

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.

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