This handy Math in Focus Grade 3 Workbook Answer Key Chapter 17 Practice 1 Understanding and Identifying Angles provides detailed solutions for the textbook questions.

## Math in Focus Grade 3 Chapter 17 Practice 1 Answer Key Understanding and Identifying Angles

**Name each figure as a point, line, or line segment.**

**Example**

Question 1.

Answer:

Line segment XY

Explanation:

A line segment is a part of a line that is bounded by two distinct end points,

and contains every point on the line that is between its endpoints.

Question 2.

Answer:

Line PQ

Explanation:

A line has no end points.

A line segment has two endpoints.

A line segment connects both endpoints.

If the two lines cannot meet at any point, they are called parallel lines.

Question 3.

Answer:

Point T

Explanation:

A point is a location represented by a dot.

A point does not have any length, width, shape or size, it only has a position.

When two distinct points are connected they form a line.

**Check (✓) the statements that are true.**

Question 4.

A line segment is part of a line.

Answer: False

Explanation:

A line segment is a part of a line that is bounded by two distinct end points,

and contains every point on the line that is between its endpoints.

Question 5.

A point is an exact location in space.

Answer: True

Explanation:

A point is a location represented by a dot.

A point does not have any length, width, shape or size, it only has a position.

When two distinct points are connected they form a line.

Question 6.

A line has two endpoints.

Answer: False

Explanation:

A line has no end points.

A line segment has two endpoints.

A line segment connects both endpoints.

If the two lines cannot meet at any point, they are called parallel lines..

**Check (✓) the box if an angle is shown.**

Question 7.

Answer:

Explanation:

The above figure doesn’t contain any angle,

they are line segments.

Question 8.

Answer:

Explanation:

The above figure contain angle greater than right angle.

So, it is Obtuse angle.

Question 9.

Answer:

Explanation:

The above figure doesn’t contain any angle,

they are line segments.

Question 10.

Answer:

Explanation:

The above figure doesn’t contain any angle,

they are perpendicular line segments.

Question 11.

Answer:

Explanation:

The above figure contain angle less than right angle.

So, it is Acute angle.

Question 12.

Answer:

Explanation:

The above figure contain angle less than right angle.

So, it is Acute angle.

**Mark two angles on each object.**

Question 13.

Answer:

Explanation:

The above figure is in rectangular shape,

it has two angles, with 90 degrees.

So, the angles are right angle triangles.

Question 14.

Answer:

Explanation:

The above figure is in Octagon,

Octagon is a polygon in geometry, which has 8 sides and 8 angles.

That means the number of vertices is 8 and the number of edges is 8.

So, octagon is a 8-sided polygon and it is a two dimensional plane figure.

All the sides are joined with each other end-to-end to form a shape.

Question 15.

Answer:

Explanation:

The above figure is in Triangle.

A triangle has three corners,

3 angles sum to 180 degrees.

Question 16.

Answer:

Explanation:

The above figure is in rectangular shape,

it has two angles, with 90 degrees.

So, the angles are right angle triangles.

Question 17.

Answer:

Explanation:

The above figure book is in rectangular shape,

it has two angles, with 90 degrees.

So, the angles are right angle triangles.

Question 18.

Answer:

Explanation:

The above figure aquarium has 3 angles.

**Mark two angles in each plane shape if possible.**

Question 19.

Answer:

Explanation:

In the above figure expect circle all the figures have 2 angles,

as the circle does not contain any angles.

**Complete the table. Mark all the angles in each plane shape.**

Question 20.

Answer:

Explanation:

The above figure is Triangle.

A triangle has three sides,

3 angles sum to 180 degrees.

Question 21.

Answer:

Explanation:

A pentagon is a five-sided polygon with five straight sides and five interior angles that sum up to 540°540°.

A pentagon shape is a plane figure, or flat (two-dimensional) 5-sided geometric shape.

Question 22.

Answer:

Explanation:

The above figure is in Octagon,

Octagon is a polygon in geometry, which has 8 sides and 8 angles.

That means the number of vertices is 8 and the number of edges is 8.

So, octagon is a 8-sided polygon and it is a two dimensional plane figure.

All the sides are joined with each other end-to-end to form a shape.

Question 23.

Answer:

Explanation:

In geometry, a hexagon can be defined as a polygon with six sides.

The two-dimensional shape has 6 sides, 6 vertices and 6 angles.

Question 24.

Answer:

Explanation:

A polygon with 10 sides and 10 angles and 10 vertices is called as Decagon.

**Draw four different plane shapes. Write the number of sides and angles in each shape.**

Question 25.

___________ sides _________ angles

Answer:

Triangle

3 sides

3 angles

Explanation:

The above figure is Triangle.

A triangle has three sides,

3 angles sum to 180 degrees.

Question 26.

___________ sides _________ angles

Answer:

Rectangle

4 sides

4 angles

Explanation:

The above figure is in rectangular shape,

it has four sides and four angles, with 90 degrees.

And the angles are right angle triangles.

Question 27.

___________ sides _________ angles

Answer:

Square

4 sides

4 angles

Explanation:

A Square is a regular quadrilateral,

which has all the four sides of equal length and,

all four angles. with right angle triangles.

Question 28.

___________ sides _________ angles

Answer:

Quadrilateral

4 sides

4 angles

Explanation:

In geometry, a quadrilateral is defined as a closed two-dimensional shape which has four straight sides .

The polygon has four vertices or corners.

It has four angles.