Practice with the help of **Spectrum Math Grade 5 Answer Key Chapter 9 Posttest **regularly and improve your accuracy in solving questions.

## Spectrum Math Grade 5 Chapter 9 Posttest Answers Key

**Check What You Learned**

**Circle all the quadrilaterals.**

Question 1.

Answer:

A quadrilateral has 4 sides.

**Identify the following polygons. Write the number that refers to the correct figure.**

Question 2.

parallelogram ______________

Answer: 2

Parallelogram – A quadrilateral with both sets of opposites sides parallel.

In the above polygons, figure 2 represents the parallelogram.

Question 3.

pentagon ______________

Answer: 1

Pentagon – A polygon with 5 sides

In the above polygons, figure 1 represents the pentagon.

Question 4.

hexagon ______________

Answer: 3

Hexagon – A polygon with 6 sides

In the above polygons, figure 3 represents the hexagon.

**Fill in the blanks to complete the hierarchy diagram.**

Question 5.

Answer:

Polygon – A closed plane figure formed from line segments that meet only at their endpoints.

Quadrilateral – A four sided polygon.

Trapezoid – A quadrilateral with exactly one pair of parallel sides.

Parallelogram – A quadrilateral with both sets of opposites sides parallel.

Rectangle – A quadrilateral with two pairs of equal parallel sides and four right angles.

Square – A parallelogram with four equal sides and four right angles.

Rhombus – A parallelogram with all four sides equal in length.

**Use a protractor to measure each angle. Then, label each angle right, acute, or obtuse.**

Question 6.

a.

Answer: 90 degrees

The type of angle in the above figure is right angle.

A right angle measures exactly 90°.

b.

Answer: 160 degrees

The type of angle in the above figure is obtuse angle.

An obtuse angle measures greater than 90° but less than 180°.

Question 7.

a.

Answer: 40 degrees

The type of angle in the above figure is acute angle.

An acute angle measures less than 90°.

b.

Answer: 120 degrees

The type of angle in the above figure is obtuse angle.

An obtuse angle measures greater than 90° but less than 180°.

**Use the circle to answer the questions.**

Question 8.

Name the circle.

Answer: S

The origin of a circle is a point inside the circle that is the same distance from any point on the circle. A circle is named by its origin.

In the above figure, Name the circle : S

Question 9.

Name the origin of the circle.

Answer: S

The origin of a circle is a point inside the circle that is the same distance from any point on the circle.

In the above figure, Name the origin : S

Question 10.

Name a radius.

Answer: \(\overline{ST}\), \(\overline{RS}\) or \(\overline{SV}\)

A radius of a circle is a line segment with one endpoint at the circle.

In the above figure, Name the radius : \(\overline{ST}\), \(\overline{RS}\) or \(\overline{SV}\)

Question 11.

Name a diameter.

Answer: \(\overline{RV}\)

A diameter is a chord that passes through the origin of the circle.

In the above figure, Name the diameter : \(\overline{RV}\)

Question 12.

Name a chord that is not a diameter.

Answer: \(\overline{VW}\)

A chord is a line segment with both endpoints on the circle.

In the above figure, Name the chord that is not a diameter : \(\overline{VW}\)