Warm Up. Please draw the diagram. S tate the given and what you want to prove. Your Turn To Present!. With your Row, you will present 4.3 20 minutes to read over 4.3 Come up with a plan on how you want to present the material PowerPoint Song/Dance Poster Paper
Please draw the diagram. State the given and what you want to prove
Apply one way of proving that two angles are right angles.
T 23: If two angles are both supplementary and congruent, then they are right angles.
Given: <1 = <2
Prove: <1 and <2 are right angles.
Since <1 and <2 form a straight angle, they are supplementary. Therefore, m<1 and m<2 = 180. Since <1 and <2 are congruent, we can use substitution to get the equation:
m<1 + m< 2 = 180 or m<1 = 90
Thus, <1 is a right angle and so is <2.
You no longer need to write the words statement and reason at the top of each proof from now on!!!!
Just make a T bar.
S is the mdpt of QR
Prove: PS QR
AB = BC = CD = AD
Prove: AC BD
Hint: Draw and label shape! Use a Detour Proof