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IndexIndex
1. Important Terms2. Types Of Angles
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Important TermsImportant Terms
• Ray- Ray is a part of line that has one endpoint and goes on endlessly in the other direction.
• Line Segment- A part of line that has two endpoints is known as line segment.
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• Line- A series of point that go endlessly in both directions is known as a line.
• Parallel Lines- Two lines that are equal distance apart and will never intersect are known as parallel lines.
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• Perpendicular Lines- Two lines that intersect to form four right angles are known as perpendicular lines.
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• Angle- The figure formed when two rays share the same endpoints.
• Vertex- The point at which two rays join together to form an angle is known as vertex.
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Types Of AnglesTypes Of Angles
• Obtuse Angle- An angle that measures more then 90° is known as obtuse angle.
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• Acute Angle- An angle that measures less then 90° is known as acute angle.
• Right Angle- An angle that measures 90° is known as right angle.
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• Straight Angle- An angle that measures 180° is known as straight angle.
• Reflex Angle- An angle that is greater then 180° is known as reflex angle.
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More AnglesMore AnglesAdjacent Angles- Adjacent Angles- Adjacent angles are Adjacent angles are angles which have a common side and a angles which have a common side and a common vertex but no interior points in common vertex but no interior points in common.common.
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• Vertically Opposite Angles- Vertically Opposite Angles are the angles opposite to each other when two lines cross.
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• Corresponding Angles- When two lines are crossed by another line the angles in matching corners are called corresponding angles.
x
y
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• Alternate Interior Angles- When two lines are crossed by another line the pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles.
a b
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• Alternate Exterior Angles- When two lines are crossed by another line the pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles.
c
d
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Thank YouThank You
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