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This Is What We Have Learned 2

by 4th Grade AMP 22-23

Pages 4 and 5 of 68

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8 - 1 Basic Geometric Ideas
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Points and lines are basic geometric ideas. Lines are sometimes
described by relationships to other lines.
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exploding head
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If you see a line crossing another line it means they intersect.
In this example you can se line U intersects line P.
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If you see this time a dot it means it is point (a letter or number).
In this example point J.
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Parallel lines can’t intersect because parallel means extending in the same direction, but without meeting.
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Reminder Forget Sticker by Roosevelt Institute
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8-2
Measuring and Classifying Angles
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Right
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In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or \pi /2 radians corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.
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Acute
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An acute angle is an angle that is less than 90°, and these angles can be measured using a protractor.
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Obtuse
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In Mathematics, “an obtuse angle is an angle which is greater than 90° and less than 180°”. In other words, an obtuse angle is between a right angle and a straight angle.
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Straight
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A straight angle is a 180° angle.