We included HMH Into Math Grade 4 Answer Key PDF Module 17 Review to make students experts in learning maths.

Vocabulary

Choose a correct Vocabulary term for the figure. Question 1. In the above figure we can observe perpendicular lines.

Question 2. In the above figure we can observe equilateral triangle.
Explanation:
An equilateral triangle has three sides of equal length. So, it is a equilateral triangle.

Question 3. In the above figure we can observe trapezoid.

Question 4. In the above figure we can observe parallel lines.
Explanation:
Lines in the same plane that never intersect and are always the same distance apart are called as parallel lines.

Question 5. In the above figure we can observe right triangle.
Explanation:
The angle which measures exactly 90 degrees is called as right angle. The above triangle having one right angle. So, it is called as right triangle.

Question 6. In the above figure we can observe Isosceles triangle.
Explanation:
An isosceles triangle has two sides of equal length. So, the above triangle is called as isosceles triangle.

Concepts and Skills

Use Tools Draw and label the figure described. Name the strategy or tool you will use to solve the problem and explain your choice.

Question 7.
$$\overleftrightarrow{S T}$$ intersecting $$\overleftrightarrow{Q R}$$ at point P The above line ST is intersecting the line QR at point P.

Question 8.
$$\overleftrightarrow{A B}$$ || $$\overleftrightarrow{C D}$$ The above lines AB and CD are parallel to each other.

Question 9.
Identify and classify the triangles. Write the name of the triangle in the correct category. Use a protractor, if needed.  Explanation:
The angle which measures less than 90 degrees is called as acute angle. The above triangle <JKL having three acute angles. So, the triangle <JKL are called as acute angled triangle.
The angle which measures greater than 90 degrees is called as obtuse angle. The above triangles <TUV and <LMN having one obtuse angle each. So, the triangles <TUV and <LMN are called as obtuse angled triangles.
The angle which measures exactly 90 degrees is called as right angle. The above triangles <ACB and <QRS having one right angle each. So, the triangles <ACB and <QRS are called as obtuse angled triangle.

Question 10.
Classify the triangle. (A) isosceles
(B) equilateral
(C) scalene
(D) right Explanation:
A scalene triangle has no sides of equal length. The above triangle have different length for all sides. So, the above triangle is scalene triangle.

Question 11.
Use the figure. Which sides appear to be parallel? Select all that apply. (A) side CF
(B) side CD
(C) side FE
(D) side DE Use a protractor and $$\overline{B C}$$. Draw an acute triangle. Label the third vertex D.  