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8 - 1 Basic Geometric IdeasLoading...

Points and lines are basic geometric ideas. Lines are sometimes described by relationships to other lines.

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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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8-2 Measuring and Classifying Angles

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RightLoading...

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.Loading...

AcuteLoading...

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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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ObtuseLoading...

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.Loading...

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StraightLoading...

A straight angle is a 180° angle.