do u cover any indirect proofs? my class is covering it right now, and i need clarification! thanx!

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Hi Nina, unfortunately indirect proofs were not filmed.  To answer a problem that asks you to use an indirect proof:1.  Assume the conclusion is false (assume the opposite)-  It it asks to prove a triangle cannot have two right angles, start by assuming the opposite: that it does2.  Use what you know to get a contradiction-  Back to the triangle example, if a triangle had 2 right angles, the third angle would have to be zero degrees (since the angle sum must be 180), which is impossible for a triangleHope this helps!