GeoGebra
Also see my profile on GeoGebraTube.
Adjacent Angles
Angles on opposite sides of a common arm are called adjacent angles.
AD is the common arm.
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Alternate Angles
Alternate angles on parallel lines.
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Angle between two lines
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Angles
Display angles from 10° to 90° in 5° increments.
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Angles at a point
Angles at a point add up to 360°.
Revolution equals 360°.
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Angles in a Right Angle
Angles in a Right Angle add up to 90°.
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Angles on a Straight Line
Angles on a Straight Line add up to 180°.
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Cointerior Angles
Cointerior angles on parallel lines.
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Corresponding Angles
Corresponding angles on parallel lines.
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Parts of a Circle
Investigate the parts of a circle. Turn on/off parts of the circle. Move some points to see how a part can look different.
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Perpendicular distance of a point from a line
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R-A-Triangle_23
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R-A-Triangle_46
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Understanding absolute value
An applet to consider the absolute value of an algebraic expression.
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Vertically Opposite Angles
Vertically opposite angles are equal.
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