# Splash Screen - PowerPoint PPT Presentation

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Splash Screen. Content Standards G.CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

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Splash Screen

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### Splash Screen

Content Standards

G.CO.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

G.CO.12 Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.).

Mathematical Practices

5 Use appropriate tools strategically.

6 Attend to precision.

### CCSS

You measured line segments.

• Measure and classify angles.

• Identify and use congruent angles and the bisector of an angle.

### Then/Now

• Ray

• a part of a line that has one endpoint and then extends infinitely in the other direction

**Name always begins with the endpoint

### Vocabulary

• Opposite rays

• choose a point on a line and either side are called opposite rays

### Vocabulary

• Angle

• formed by two noncollinear rays (sides) that have a common endpoint (vertex)

### Vocabulary

• Interior

• “inside the angle”

• Exterior

• “outside the angle”

### Vocabulary

• angle bisector

• a ray that divides an angle into 2 congruent angles

### Vocabulary

Angles and Their Parts

A. Name all angles that have B as a vertex.

### Example 1

Angles and Their Parts

B.Name the sides of5.

### Example 1

C.

Angles and Their Parts

A.

B.

C.

D.

A.

A.

B.

C.

D.none of these

B.

### Example 1b

A.

B.

C.

D.

Which of the following is another name for 3?

C.

### Concept

Measure and Classify Angles

A. Measure TYV and classify it as right, acute, or obtuse.

### Example 2

Measure and Classify Angles

### Example 2

Measure and Classify Angles

### Example 2

Measure and Classify Angles

INTERIOR DESIGN Wall stickers of standard shapes are often used to provide a stimulating environment for a young child’s room. A five-pointed star sticker is shown with vertices labeled. Find mGBH and mHCI if GBH  HCI, mGBH = 2x + 5, and mHCI =3x – 10.