unit 1.4 flashcards- proofs

If an angle is a right angle

then it measures 90 degrees

if points lie on the same line

then they are collinear

if two segs or angles are congruent

then they have the same measure

if points are collinear

then they lie on the same line

can you flip definitions?

yes

can you flip theorems?

no

if two segs or angles have the same measure

then they are congruent

if an angle is a straight angle

then it measures 180

if an angle measures 180

then it is a straight angle

if two angles are right angles

then they are congruent

if two angles are straight angles

then they are congruent

if two lines are perpendicular

then they intersect at a right angle

if two lines intersect at a right angle

then they are perpendicular

if a pt/seg/ray/line divides a seg into two congruent segs

then it bisects the seg

if a pt/seg/ray/line bisects the seg

then it divides the seg into to congruent segs

if a point divides a seg into 2 congruent segs

then it is a midpt

if a point is a midpt

then it divides a seg into two congruent segs

if two pts divide a seg into three congruent segs

then they trisect the seg

if two pts trisect a seg

then they divide a seg into three congruent segs

can rays/lines be bi/trisected

no