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Using Time to Explore AnglesPowerPoint Presentation

Using Time to Explore Angles

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### Geometry Terms to Know

### Geometry Terms to Know

### Geometry Terms to Know

### Geometry Terms to Know

### Geometry Terms to Know

### Geometry Terms to Know

### Types of Angles

### Acute Angles

### Acute Angles

### Acute Angles

### Straight Angles

### Obtuse Angles

### Obtuse Angles

### Obtuse Angles

endpoints

Look in your book on page 440.

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.

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.

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

Look in your book on page 440.

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

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

We measure this distance in a unit called degrees.

The symbol for degrees is a small superscript circle.

Degrees = 45°

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

There are essentially three different types of angles.

Set your clock to 2:00.

Set your clock to 1:00.

The hands of the clocks form acute angles.

Set your clock to 11:00.

Set your clock to 10:00.

The hands of the clocks form acute angles.

Acute angles measure less than 90 degrees.

Straight angles measure exactly 180 degrees.

Set your clock to 5:00.

Set your clock to 4:00.

The hands of the clocks form obtuse angles.

Set your clock to 8:00.

Set your clock to 7:00.

The hands of the clocks form obtuse angles.

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

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