Question

Help please! I am attaching a picture.

Answer 1

I apologize, i don't

Answer 2

Umm not sure.. try asking some of the moderators

Answer 3

one sec

Answer 4

@hartnn @myininaya

Answer 5

Thanks

Answer 6

The little cross-lines mean those lines are congruent and the little arcs mean those angles are congruent. That helps you a lot.

Answer 7

I know that but how do I prove that the line down the middle is a perpendicular bisector.

Answer 8

it is not perpendicular bisector.
tell me if you know,
sum of all angles in a triangle = .... ?

Answer 9

y=43 degrees
and x=90 degrees

Answer 10

180 @hartnn

Answer 11

How did you get that though @croslali ?

Answer 12

wait lemme explain

Answer 13

correct!
so, you know A = 2y, right ?
and A+B+C = 180
so ,whats angle B in terms of y ?

Answer 14

see .. you that one angle of the triangle is 47 degrees ... but since ab=ac even angle ABC becomes 47 degrees

Answer 15

I dont know in terms of y, but I do know B is 47 since it is isosceles. @hartnn

Answer 16

now use the angle sum rule for the entire triangle
we get 47+47+2y=180
when we equate we get y=43

Answer 17

A+B+C = 180
2y + B + 47 = 180
and we know B = 47
so,
2y +47+47 =180
you can easily find y from here :)

Answer 18

then again use angle sum rule for that small triangle ... and you will get
47+y+x=180
that is 47+43+x=180
upon simplification we get x=90

Answer 19

Okayso now I know how to get y, but how do I prove x is equal to 90 degrees

Answer 20

@croslali why are you in so much hurry to give out answers and steps ?

Answer 21

in triangle ABD
you know 2 angles out of 3

Answer 22

so just use sum of angles = 180 and find the 3rd

Answer 23

im sorry hartnn .. im only 16 i dont have patience .. i try alot but my phone is very tiny to type in

Answer 24

Okay. Thank you both so much!! @hartnn @croslali

Answer 25

after you find y then put the value of y in the the triangle abd and use angle sum rule again

Answer 26

welcome ^_^

Answer 27

i will try to give the answers slowly hartnn

Answer 28

thanks for understanding :)
and don't give out answers, guide them through it.

Answer 29

ok thanks :P

Answer 30

hey wait i got a mail that says i got a warning