anglesandtriangles

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Slide 1  Angles and Triangles

Slide 2  Angles
 A shape formed by two rays sharing a common endpoint; contains two rays and a vertex
 ray
 ray
 vertex
 ray—has one endpoint and goes infinitely in one direction
 vertex—point common to two rays of a triangle or two sides of a polygon

Slide 3  Types of Angles
 Acute angle: An angle whose measure is greater than zero degrees and less than 90 degrees
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Slide 4  Types of Angles
 Right angle: Angle that measures 90 degrees
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Slide 5  Types of Angles
 Obtuse angle: One angle measures greater than 90 degrees and less than 180 degrees
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Slide 6  Straight Angle
 Straight angle: A line that goes infinitely in both directions and measures 180 degrees
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 This is a ray. It only goes in one direction.

Slide 7  Types of Triangles
 Equilateral triangle: A triangle with three congruent (equal) sides and three equal angles
 These marks indicate equality.

Slide 8  Types of Triangles
 Isosceles triangle: A triangle with at least two congruent (equal) sides

Slide 9  Types of Triangles
 Right triangle: Has only one right angle (90 degrees)
 This box indicates a right angle or a 90degree angle.

Slide 10  Types of Triangles
 Scalene triangle: A triangle that has no congruent (equal) sides

Slide 11  Interior Angles
 Interior angles: An interior angle (or internal angle) is an angle formed by two sides of a simple polygon that share an endpoint
 Interior angles of a triangle always equal 180 degrees.

Slide 12  Measuring Angles
 You measure angles with a protractor.
 This point goes at the vertex of the angle
 This point is 0
 This point is 0.
 Notice there are two scales. Be careful which 0 you start at.
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