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Angles - PowerPoint PPT Presentation

Angles. Angle Formation. An angle is formed by two rays that share a common endpoint . The sides of an angle are the two rays. The vertex of an angle is the common endpoint of the two rays. Naming Angles By The Vertex. You can name the angle by the vertex IF, there is only one angle.

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Presentation Transcript

Angles

• An angle is formed by two rays that share a common endpoint. The sides of an angle are the two rays. The vertex of an angle is the common endpoint of the two rays.

• You can name the angle by the vertex IF, there is only one angle.

•  B Not Possible

• When using three letters to name an angle:

• The letter in the center is ALWAYS the Vertex.

• The letters on either side are from each side of the angle.

• ZGR Or RGZ

• If the Vertex is numbered, you can use the Number to name the Angle.

• 3

• A protractor is a basic tool used to measure angles. One unit of measure for angles is degrees (º).

• When writing the Measure of an Angle we use m(angle) = degrees

• mDKX = 30 degrees

• Acute

• Right

• Obtuse

• Straight or Linear

• Angles whose Measure is greater than Zero degrees but less than ninety degrees

• Right Angles have a measurement of ninety degrees.

• ***Warning*** there ARE NO LEFT angles!!!

• The word Right comes from the latinRect, NOT Your hand.

• Obtuse angles are greater than ninety degrees but less than one-hundred eighty degrees.

• Straight angles, linear angles have a measure of one-hundred eighty degrees.

• Supplementary Angles

• Complementary Angles

• Perpendicular Relationships

• Linear Pair

• Vertical Angles

• Two angles are supplementary angles if the sum of their angle measures is equal to 180º.

• Two angles are complementary angles if the sum of their angle measures is equal to 90º.

• Two lines, line segments, or rays are perpendicular if they intersect to form 90º angles. The perpendicular symbol is .

• Adjacent angles are two angles that share a common vertex and share a common side.

Linear Pair

• A linear pair of angles are two adjacent angles that have noncommon sides that form a line.

• Vertical angles are two nonadjacent angles that are formed by two intersecting lines.