Question

Okay so I subtracted 125 from 180 right?
and it gave me 55 degrees which is the answer.
But I don't understand why it's 55 degrees? I only got the answer because I knew what the answer would end up being.

Answer 1

This is the angles.

Answer 2

This is the question.

Answer 3

Triangles's angles sums are always 180 degrees.

Answer 4

Okay I understand that but I mean since I'm finding angle BCA Why did I have to subtract 125 from 180? instead of including angle B n my equation?

Answer 5

so angle AD =180 degree ,yes ?

Answer 6

Oh now that I look at it...Yes!

Answer 7

so and angle C =125 degree ,yes ?

Answer 8

C like mBCD ,ok than angfle C inside triangle + 125 =180

Answer 9

than angle C inside triangle =180-125=55

Answer 10

hold on let me just read this slowly.

Answer 11

you have understood it now right sure ?

Answer 12

OHHHH. So what you're saying is that since we already know the measurement of angle C and we know that angle AD is a straight line equaling 180 degrees we would take 125 from 180 because that would give us...angle A? or wait..

Answer 13

or er. line AD.

Answer 14

not

so if you check it there angle C is divided in two parts one inside triangle and one exterior triangle ,yes ?

Answer 15

yes

Answer 16

so the line AD has a degree of 180 ,yes ?

Answer 17

and we know again that the exterior part of angle C is 125 degree so than just you need subtract from 180 this 125 degree and will get the measure of angle C inside triangle

Answer 18

Ohhhhhhhhhhhhhhhhh. I understand.

Answer 19

good luck

bye