Topics
3. Geometry: Pythagorean Theorem, Congruence & Similarity Transformations
topic badge
United States of AmericaNJ
Grade 8

3.09 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
Sign up to access Practice Questions
Get full access to our content with a Mathspace account
Book a Demo
Sign up for free

Outcomes

8.G.A.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.

What is Mathspace

About Mathspace