a very basic idea about angles and triangles, for class v and vi
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Angles and Triangles
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Angles O A shape formed by two rays sharing a common endpoint; contains two rays and a rte x v e rtex —point common to two rte x rays of a triangle ortwo sides of a polygon ray Ifay—has one endpoint and goes infinitely in one direction ray
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Types of Angles O Acute angle: An angle whose measure is greater than zero degrees andAess than 90 degrees Which angles are not acute? 4 —1 3 2 5
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Types of Angles Right angle: Angle thaemeasures 90 degrees Which angle is a righeangle? 4 —1 3 5 2
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Types of Angles O Obtuse angle: One angle measures greaterthan 90 degrees and less than 180 degrees Which angle is an obtuse angle? 4 —1 3 2 5
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Straight Angle O Straight angle: A line that goes _infinitely in both directions and measures 180 degrees WhichMs not a straight angle? 1 This is a ray. It only
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Types of Triangles O Equilateral triangle: A triangle with three and three Ahese marks indicate equality.
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Types of Triangles O Isosceles triangle: A triangle with at least two congruent (equal) sides
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Types of Triangles O Right triangle: Has only one right angle degrees) This box indicates a right angle ora 90-degree angle.
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Types of Triangles O Scalene triangle: A triangle that has no congruene(equal) sides
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Types of Triangles O Name each type of triangle 4 2 1 3
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Types of Triangles O Name each type of triangle Right 1 Equilateral 2 3 4 Scalene Isosceles
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InteriorAngles O Interiorangles: An interior angle (orinternaIangIe)Ms an angle formed by two sides of a simple polygon that share an endpoint O Interior angles of a triangle always equal 180 degrees.
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Measuring Angles You measure angles with a protractor. Notice there are two scales. Be careful which O you start at. go / 60 40 40 900 This point is This point is O. This point goes at the vertex of the angle
Discussion
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