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### Angles and Polygons

Sections 1.5 & 1.6

Vocabulary

An angle consists of two different rays with the same endpoint.

The rays are the sides of the angle.

The endpoint is the vertex of the angle.

Vocabulary

An acute angle has a measure between 0o and 90o

A right angle has a measure of 90o

An obtuse angle has a measure between 90o and 180o

A straight angle has a measure of 180o

Vocabulary

Two angle are congruent angles if they have the same measure.

An angle bisector is a ray that divides an angle into two congruent angles.

Vocabulary

Two angles are complementary angles if the sum of their measures is 90o.

Two angles are supplementary angles if the sum of their measures is 180o.

Vocabulary

Adjacent angles are two angles that share a common vertex and side, but have no common interior points.

Vocabulary

Two adjacent angles are a linear pair if their noncommon sides are opposite rays.

The angles in a linear pair are supplementary angles.

Vocabulary

Two angles are vertical angles if their sides form two pairs of opposite rays.

Vertical angles are congruent to each other.

Vocabulary

An angle is named with three points, just the vertex, or a number.

An angle can be named with just the vertex only if it is the only angle with that particular vertex.

The vertex is always the middle point when naming an angle with three points.

Vocabulary

When naming an angle, always remember to put a symbol in front. Otherwise you are naming a point or plane.

To denote the measure of an angle, we write an “m” in front of the angle sign: o

Angle Addition Postulate

If P is in the interior of , then the measure of is equal to the sum of the measures of and .

Vocabulary

To show that two angles in a diagram are congruent, we put an arc inside each angle.

Vocabulary

A polygon is a closed two-dimensional shape with straight sides.

Vocabulary

A polygon is convex if no line that contains a side of the polygon contains a point in the interior of the polygon.

A polygon that is not convex is called concave.

Vocabulary

In an equilateral polygon, all sides are congruent.

In an equiangular polygon, all angles in the interior of the polygon are congruent.

A regular polygon is a convex polygon that is both equilateral and equiangular.

Vocabulary

3 sides Triangle

4 sides Quadrilateral

5 sides Pentagon

6 sides Hexagon

7 sides Heptagon

8 sides Octagon

9 sides Nonagon

10 sides Decagon

11 sides Undecagon

12 sides Dodecagon

n sides n-gon

Summary

- Complete the following sentences in your summary section for homework tonight:
- A vertical angle is different from a linear pair because …
- The similarities and differences of equilateral, equiangular, and regular are …

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