Question

Δ ABC is isosceles. Angles B and C are congruent. The m∠A = 40°, m∠B = (3x + 1)°. Find x.

Answer 1

you know, when it a isosceles triangle, which makes 2 angles equal to the third, right?

Answer 2

Yeah?

Answer 3

so you got this right?
m<A=m<B right? so from here you can solve it :) it just gonna give you super ugly number though :)

Answer 4

Are you sure? The answers are
A)
13
B)
23
C)
46.3
D)
70
They aren't ugly?

Answer 5

well,

Answer 6

if there were your answers then you should do this:
m<A + m<B = 180 ( we don't need C since B = C)
40 + 3x +1 =180
41 +3x =180
3x= 139
x =46.3 :)

Answer 7

Thank you! :D

Answer 8

cuz if you use m<A = m<B is gonna give you 13. something ( very ugly)