Triangles

1. Classify $\triangle A B C$ by its angles.

Choose 1 answer:

(A) Acute triangle

(B) Obtuse triangle

(C) Right triangle

2. Classify $\triangle J K L$ by its angles.

Choose 1 answer:

(A) Acute triangle

(B) Obtuse triangle

(C) Right triangle

3. Classify $\triangle D E F$ by its angles.

Choose 1 answer:

(A) Acute triangle

(B) Obtuse triangle

(C) Right triangle

4. Which figure is an acute triangle?

Choose 1 answer:

1. $\triangle A B C$ is an acute triangle.

2. $\triangle J K L$ is a right triangle.

3. $\triangle D E F$ is an obtuse triangle.

4. $\triangle S T U$ is an acute triangle.

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 ).

1. $\triangle L M N$ is an isosceles triangle and an acute triangle.

2. Lauren's triangle is an acute triangle and an isosceles triangle.

3. $\triangle G H I$ is an acute triangle and an isosceles triangle.

4. $\triangle N O P$ is an isosceles triangle and an obtuse triangle.