Angles that are in the area between the parallel lines like angle 2 and 8 above are called interior angles whereas the angles that are on the outside of the two parallel lines like 1 and 6 are called exterior angles. Lines rays and angles this fourth grade geometry lesson teaches the definitions for a line ray angle acute angle right angle and obtuse angle. Learn shapes shapes lines angles with free interactive flashcards choose from 500 different sets of shapes shapes lines angles flashcards on quizlet log in sign up shapes shapes lines angles flashcards line of symmetry obtuse triangle a triangle with three acute angles. Lines angles and shapes parallel and perpendicular lines 1 2 3 circle the quadrilaterals lines angles and shapes polygons and quadrilaterals 1 polygons are shapes with 3 or more sides draw a line on each shape to show where you would cut to get the smallest. Geometry geometry is all about shapes and their properties geometry can be divided into plane geometry is about flat shapes like lines circles and triangles shapes that can be drawn on a piece of paper solid geometry is about three dimensional objects like cubes angles on a straight line interior angles exterior angles
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