Using Time to Explore Angles

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# Using Time to Explore Angles - PowerPoint PPT Presentation

Using Time to Explore Angles. A. endpoints. Look in your book on page 440. Geometry Terms to Know. Line - a straight path between two points that goes on forever in both directions. Point - an exact place in space.

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### Using Time to Explore Angles

A

endpoints

Look in your book on page 440.

### Geometry Terms to Know

Line - a straight path between two points that goes on forever in both directions.

Point - an exact place in space.

Line Segment - part of a line; has a distinct starting point and ending point.

Look in your book on page 440.

### Geometry Terms to Know

Ray - part of a line; has a definite starting point, but no ending point; goes on forever in one direction.

Endpoint

Look in your book on page 440.

### Geometry Terms to Know

Angle - formed by two lines, rays, or line segments that have the same endpoint.

Look in your book on page 440.

### Geometry Terms to Know

Angle - formed by two lines, rays, or line segments that have the same endpoint. This end point is called the vertex.

### Geometry Terms to Know

We measure angles by measuring the distance between the two sides of the angle.

### Geometry Terms to Know

We measure this distance in a unit called degrees.

The symbol for degrees is a small superscript circle.

Degrees = 45°

### Types of Angles

Let’s use our clocks to discover the names of these angles.

There are essentially three different types of angles.

### Right Angles

Set your clock to 3:00.

The hands of the clock form a right angle.

### Right Angles

Set your clock to 9:00.

The hands of the clock form a right angle.

### Right Angles

Right angles measure

exactly 90 degrees.

### Acute Angles

Set your clock to 2:00.

Set your clock to 1:00.

The hands of the clocks form acute angles.

### Acute Angles

Set your clock to 11:00.

Set your clock to 10:00.

The hands of the clocks form acute angles.

### Acute Angles

Acute angles measure less than 90 degrees.

### Straight Angles

Set your clock to 6:00.

The hands of the clock form a straight angle.

### Straight Angles

Straight angles measure exactly 180 degrees.

### Obtuse Angles

Set your clock to 5:00.

Set your clock to 4:00.

The hands of the clocks form obtuse angles.

### Obtuse Angles

Set your clock to 8:00.

Set your clock to 7:00.

The hands of the clocks form obtuse angles.

### Obtuse Angles

Obtuse angles measure more than 90 degrees butless than 180 degrees.