These are links to Khan Academy resources.

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This is a first year, high-school level course on Geometry (which is based on Euclid's elements). It revisits many of the basic geometrical concepts studied in earlier courses, but addresses them with more mathematical rigor. There is strong focus on proving theorems and results from basic postulates.
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In this lesson from Khan Academy, points, lines and planes are discussed as part of an introduction to Euclidean geometry.
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This video defines angles, shows several examples of angles, and teaches some simple rules for analyzing them using the degrees of a circle, a straight line, and perpendicular lines.
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In this interactive practice activity from Khan Academy, students use their knowledge of complementary and supplementary angles to solve for x.
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Axis of Symmetry

by Sandy Gade

In this interactive activity from Khan Academy, students identify lines of symmetry from a visual.
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Measuring Angles

by Sandy Gade

In this interactive activity from Khan Academy, students will use a protractor to measure a given angle.
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