Question

HELP!! Bad at Proofs!!
Given: In triangle ABC, angle A=135 degrees
Prove: angle B does not equal 45 degrees (write an indirect proof)

Answer 1

that makes the angle C be zero.
it is not a triangle

Answer 2

i assumed B is right be 45 deg

Answer 3

angle A + angle B + angle C = 180 degrees

135 deg + angle B + angle C = 180 deg

angle B + angle C = 45 deg.

Answer 4

it's B

Answer 5

actually, its called contradiction

Answer 6

@RadEn yup