This handy Spectrum Math Grade 4 Answer Key Chapter 8 PosttestĀ provides detailed answers for the workbook questions.

Check What You Learned

Draw the line (or lines) of symmetry if the shape is symmetrical.

Question 1.
a.

Symmetrical
Explanation:
The above given figure has only one line of symmetry. So, drawn the line of symmetry.

b.

Symmetrical
Explanation:
The above given figure has only one line of symmetry. So, drawn the line of symmetry.

c.

Symmetrical
Explanation:
The above given figure has only one line of symmetry. So, drawn the line of symmetry.

d.

Symmetrical
Explanation:
The above given figure has only one line of symmetry. So, drawn the line of symmetry.

Identify the lines as perpendicular, parallel, or intersecting.

Question 2.
a.

Type of Lines:Ā Parallel
Explanation:
The above given pair of lines are parallel lines. The two given lines are not intersecting at any point and are always the same distance apart.

b.

Type of Lines:Ā Perpendicular
Explanation:
The above given pair of lines are perpendicular lines. The two given lines are intersecting and forming a right angle at their intersection. Hence given two lines are perpendicular to each other.

c.

Type of Lines:Ā Perpendicular
Explanation:
The above given pair of lines are perpendicular lines. The two given lines AB and BC are intersecting and forming a right angle at their intersection point B. Hence AB and BC are perpendicular to each other.

d.

Type of Lines:Ā Parallel
Explanation:
The above given pair of lines are parallel lines. The two given lines EF and HG are not intersecting at any point and are always the same distance apart.

Draw each angle.

Question 3.
a. ā QRS

Explanation:
The given angle ā QRS is drawn as we can observe in the above image.

b. ā 567

Explanation:
The given angle ā 567 is drawn as we can observe in the above image.

c. ā DEF

Explanation:
The given angle ā DEF is drawn as we can observe in the above image.

Question 4.

Trapezoid
Explanation:
A quadrilateral is a polygon with four sides. The above given quadrilateral is trapezoid. A trapezoid has two sides that are parallel to each other.

Identify the triangle.

Question 5.