Question

Given: tangent to Circle O.

If m = 140°, then A =

70
110
140
http://assets.openstudy.com/updates/attachments/53739855e4b0530e83f03f38-tootsi123-1400084606214-group179.gif

Answer 1

@ganeshie8

Answer 2

@geerky42

Answer 3

@freckles

Answer 4

m = 140° ?

Do you mean \(m\angle C=140^\text o\)

Answer 5

sorry, its m DB with an arch over that= 140

Answer 6

would it be 140?

Answer 7

I think that refers to arc DAB (minor arc), right?

Answer 8

right

Answer 9

In that case, then angle half the 140

Answer 10

so, because DB = 140 DAB = 140?

Answer 11

Sorry I am on laptop.

What I am trying to say is that given the information, we can see that angle C is half the measure of arc BD

Answer 12

Then given ABCD is inscribed in circle, we know that sum of opposite angles is always 180, right?

Answer 13

Do you follow me?

Answer 14

right

Answer 15

and yes

Answer 16

Okay, then we have \(m\angle A+m\angle C = 180^\text o\)

Answer 17

we figured out that C is 70.

Answer 18

Right?

Answer 19

right

Answer 20

wait, i got the answer. my teacher came by and just gave me it. thank you for your time!!! i understand it better now

Answer 21

i had rather her explain it to me though

Answer 22

ok, answer is 110, right?

Answer 23

ok great!

Answer 24

thats what she said. thanks again!

Answer 25

ok no problem