Definition of 'altitude' and the various different ways the word is used in geometry
Math Open Reference
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Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.
Online Math Learning
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Identify the missing angle measurement in each set of supplementary angles. Answers included.
Math-Drills.com
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Identify the missing angle measurement in each set of complementary angles. Answers included.
Math-Drills.com
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Explanation of acute angles
Math is Fun
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Similar triangles - two sides in same proportion, included angle the same. SAS
Math Open Reference
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In this Early Edge video lesson, you'll learn more about Triangles, so you can be successful when you take on high-school Math & Geometry.
The Princeton Review
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Definition of a subtended angle - the angle created by an object at a given external point
Math Open Reference
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Similar triangles - all three sides in same proportion. SSS
Math Open Reference
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Definition of a segment of a circle.
Math Open Reference
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