Math Vocabulary for Geometry Unit
KEY MATH LEARNINGS FOR UNIT 4
• An angle is formed when two lines meet.
• The size of an angle is a measure of the amount of turn needed to move from one arm to the other.
• An angle can be named by the way it relates to a right angle or a straight angle.
• Concrete, non-standard units can be used to measure and compare angles.
• Angles can be measured using a standard protractor.
• Angles are classified according to their measures in degrees.
• To estimate the measure of an angle, we can use 45, 90, 180, as reference angles.
• An angle of a given measure can be constructed using a standard protractor.
• Angles of 45, 90, and 180 can be drawn without using a protractor.
• The sum of the interior angles in any triangle is 180.
• The sum of the angles in a quadrilateral is 360.
Study Guide
For the spot checks, I need to be able to:
• Estimate the size of an angle
• Name and define angles: obtuse, acute, right and reflex
• Use a protractor to measure angles
• Draw a reflex angle using a 180 protactor
• Draw and label an angle when given the measure
• Find the missing measure in a triangle or a quadrilateral without using a protractor
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