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How do I prove that an angle in a semicircle is a right angle?
I need the proof (in chart form). Here is a photo of what I mean:
http://www.mathagonyaunt.co.uk/TES_ARTICLES/Past_articles/2003/JUN_03/JUN_13_03/Image6.jpg
How do I prove that angle ABC is a right angle? In a T chart proof please.
I am not familiar with T chart proofs but here is a way to prove angel C is a right angle. The two interior triangles are isosceles as two of their sides are radii. the two triangles contain 180 + 180 = 360 degrees. the sum of the two angle O s is 180 degrees. 360 - 180 = 180
the angles at Two angles at C = A + B therefore C = 180/2 = 90 degrees.
Acute, Right, Obtuse, and Straight Angles - YourTeacher.com