Triangles

Watch this lecture series, which discusses how to classify triangles by lengths of their sides and measures of their angles.

Practice

Classify triangles by both sides and angles - Questions

1. Classify \triangle L M N.



Choose 2 answers:

(A) Isosceles triangle

(B) Scalene triangle

(C) Right triangle

(D) Equilateral triangle

(E) Acute triangle

(F) Obtuse triangle

2. Lauren drew a triangle. Its sides were 7 mm , 9 mm, and 7 mm.

It has three acute angles.

Complete the sentence to describe the triangle Lauren drew.

Lauren's triangle is ________ (an acute triangle\an obtuse triangle\a right triangle ) and ________ (an equilateral triangle\an isosceles triangle\a scalene triangle ).

3. Complete the sentence to describe the triangle shown.

\triangle G H I is ________ (an acute triangle\an obtuse triangle\a right triangle ) and ________ (an equilateral triangle\an isosceles triangle\a scalene triangle ).

4. Complete the sentence to describe the triangle shown.



\triangle NOP is ________ (an acute triangle\an obtuse triangle\a right triangle ) and ________ (an equilateral triangle\an isosceles triangle\a scalene triangle ).