Vertical angles are equal. If 1=2 then 3=4. QED

bjh

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- December 6th 2010, 07:15 AM #1

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- December 6th 2010, 07:45 AM #2

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- December 6th 2010, 07:57 AM #3
A straight line is 180 degrees.

Then, angle 1 + T = 180 degrees

angle 3 + T = 180 degrees

which makes angle 1 = angle 3

Then, angle 4 + S = 180 degrees

angle 2 + S = 180 degress

which makes angle 4 = angle 2

if, angle 1 and angle 2 are equal then angle 3 = angle 4

this makes tks an isosceles triangle