This handy Math in Focus Grade 5 Workbook Answer Key Chapter 13 Practice 1 Classifying Triangles provides detailed solutions for the textbook questions.

## Math in Focus Grade 5 Chapter 13 Practice 1 Answer Key Classifying Triangles

**Which of these triangles are equilateral, isosceles, or scalene? Use a centimeter ruler to find out.**

Question 1.

Triangle ABC is a/an triangle.

__Equilateral_ triangle.

Answer:

Triangle ABC is an equilateral triangle,

Explanation:

Given triangle ABC is an equilateral triangle because all

given 3 sides are equal.

Question 2.

Triangle DEF is a/an

_____ triangle.

Answer:

Triangle DEF is an isosceles triangle,

Explanation:

Given triangle DEF is an isosceles triangle because

only 2 sides are equal and congurent.

Question 3.

Triangle LMN is a/an

_____ triangle.

Answer:

Triangle LMN is an scalene triangle,

Explanation:

Given triangle LMN is an scalene triangle because all

given 3 sides are not equal as LM ≠ MN ≠ LN.

Question 4.

Triangle PQR is a/an

___ triangle.

Answer:

Triangle PQR is a scalene triangle,

Explanation:

Given triangle PQR is a scalene triangle because all

given 3 sides are not equal as PQ ≠ PR ≠ RQ.

**Which of these triangles are right, obtuse, or acute? Use a protractor to find out.**

Question 5.

Triangle ABC is a/an

____ triangle.

Answer:

Explanation:

Given triangle ABC is acute triangle, because angle B and C is measuring less than 90^{0}.

Question 6.

Triangle DEF is a/an

____ triangle.

Answer:

Explanation:

Given triangle DEF is right triangle, because angle D is measuring 90^{0}.

Question 7.

Triangle LMN is a/an

____ triangle.

Answer:

Explanation:

Given triangle LMN is obtuse triangle, because angle L is measuring more than 90^{0 }as 110^{0}.

Question 8.

Triangle PQR is a/an

____ triangle.

Answer:

Explanation:

Given triangle PRQ is right triangle, because angle P is measuring 90^{0}.