angles and rays

Angles and Rays

Let’s review first•What is this?

Ray

What is this called?

Angle

1

2

What are these called?

Sides

The above angle is named:

Ray

Ray

C

A

B

ABC CBA B

What is this called?

Ray

Ray

Vertex

OBTUSE ANGLE

B

X

O

What type of angle is this?

RIGHT ANGLE

What type of angle is this?

ACUTE ANGLE

Z

X

Y

What type of angle is this?

RIGHT ANGLEB

A C

What type of angle is this?

OBTUSE ANGLE

M

D

B

What type of angle is this?

ACUTE ANGLE

Z

X

Y

What type of angle is this?

Turn to page 37 in your math book

• Take the next three minutes to complete numbers 1 -20 on your own. •Write acute, right or obtuse.

Check your answers!• 1. Acute 11. Acute• 2. Obtuse 12. Right• 3. Obtuse 13. Acute• 4. Right 14. Obtuse• 5. Acute 15. Acute• 6. Acute 16. Acute• 7. Acute 17. Obtuse• 8. Acute 18. Acute• 9. Obtuse 19. Acute• 10. Right 20. Right

Types of Angles

• Narrow Skinny

Z

X

YThe area between the two rays on an acute angle is narrow.

Types of Angles

• Wide Fatter

The area between the two rays on an obtuse angle is wide.

M

D

B

Lets look at page 38 together.

• 1. The narrowest kind of angle is a(n) ____________________ angle.

Obtuse Acute Right

Lets look at page 38 together.

• 2. A(n) ____________________ angle is wider than an acute angle, but narrower than an obtuse angle.

Obtuse Acute Right

Lets look at page 38 together.

• 3. A(n) ____________________ angle is wider than a right angle, but narrower than a straight angle.

Obtuse Acute Right

Lets look at page 38 together.

• 4. A(n) ____________________ angle is the widest of these kinds of angles.

Straight angle

Lets look at page 38 together.

• 5. Underline the correct answer.

• An (acute, obtuse ) angle is wider than a right angle.

Homework• Draw each of the four types of angles we just

talked about in class and label them.