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## Go Math Grade 3 Chapter 12 Two-Dimensional Shapes Extra Practice Answer Key

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### Common Core – Page No. 257000

**Chapter 12 Extra Practice**

**Lessons 12.1â€“12.3**

**Name the polygon.**

Question 1.

_________

Answer:

quadrilateral

Explanation:

4 sides; 4 angles; quadrilateral

Question 2.

_________

Answer:

decagon

Explanation:

10 sides; 10 angles; decagon

Question 3.

_________

Answer:

hexagon

Explanation:

6 sides; 6 angles; hexagon

Question 4.

_________

Answer:

triangle

Explanation:

3 sides; 3 angles; triangle

Question 5.

_________

Answer:

octagon

Explanation:

8 sides; 8 angles; octagon

Question 6.

_________

Answer:

pentagon

Explanation:

5 sides; 5 angles; pentagon

**Lesson 12.4**

**Look at the dashed sides of the polygon. Tell if they appear to be intersecting, perpendicular, or parallel. Write all the words that describe the sides.**

Question 7.

_________

_________

Answer:

perpendicular lines

Explanation:

The dashed sides are meeting to form a right angle. So, they are perpendicular lines.

Question 8.

_________

Answer:

parallel lines

Explanation:

The dashed sides are not intersecting with each other. So, the given lines are parallel lines.

Question 9.

_________

Answer:

intersecting lines

Explanation:

The dashed line segments meet and form an angle. So, they are intersecting lines.

**Lesson 12.5**

**Circle all the words that describe the quadrilateral.**

Question 10.

Options:

a. rhombus

b. trapezoid

c. rectangle

Answer:

c. rectangle

Explanation:

The given shape has two pairs opposite with the same length. Also, all the angles are right angles. The given shape is a rectangle.

Question 11.

Options:

a. square

b. rhombus

c. trapezoid

Answer:

a. square

b. rhombus

Explanation:

The given shape has 4 sides with equal lengths. Also, all the angles are right angles. So, a possible answer is a square and rhombus.

Question 12.

Options:

a. trapezoid

b. rectangle

c. rhombus

Answer:

a. trapezoid

Explanation:

Even though the given shape has four sides, they are not equal. Also, it has only two right angles. The given shape is a trapezoid.

### Common Core – Page No. 258000

**Lesson 12.6**

**Draw a quadrilateral that does not belong. Then explain why.**

Question 1.

Type below:

_________

Answer:

Explanation:

The shape is a trapezoid. Even though the given shape has four sides, they are not equal. Also, the angles are not right angles.

**Lesson 12.7**

**Use the triangles for 1â€“2. Write A, B, or C.**

**Then complete the sentences.**

Question 2.

Triangle ____ has 1 angle greater than a right angle and appears to have ____ sides of equal length.

Answer:

Triangle **C** has 1 angle greater than a right angle and appears to have **0**Â sides of equal length.

Question 3.

Triangle____ has 1 right angle and appears to have ____ sides of equal length.

Answer:

Triangle **A** has 1 right angle and appears to have **2** sides of equal length.

**Lesson 12.8
**

Question 4.

What label could you use to describe Circle A?

Type below:

_________

Answer:

All sides of Equal Lengths

Question 5.

What label could you use to describe Circle B?

Type below:

_________

Answer:

Right Angle

**Lesson 12.9**

**Draw lines to divide the shape into equal parts that show the fraction given.**

Question 6.

\(\frac{1}{4}\)

Answer:

Question 7.

\(\frac{1}{3}\)

Answer:

### Conclusion

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