Question

If m RDC = 120°, then m DAC=?

https://media.glynlyon.com/g_geo_2012/7/group179.gif

Answer 1

Anything else given?

Answer 2

Nope

Answer 3

I could really use alot of help though

Answer 4

Given: DR tangent to Circle O.

If m C = 63°, then m BDR =?
63?
90?
126? Is it this?

Answer 5

If m RDC = 120°, then m DAC=??
60?
120?<< This?
240?

Answer 6

C is given as 63' ?

Answer 7

Yes. C=63, do what would BDR equal

Answer 8

so"

Answer 9

So DCB is 63 or OCB is 63'
If it is OCB i can help!!!

Answer 10

It only says c=63, so what would BDR =?

Answer 11

does BDR equal 126?

Answer 12

Are you looking for mDAC, or mDAB? @breton

Answer 13

m DAC

Answer 14

Ok...

Answer 15

I'm confused, because there is no angle DAC

Answer 16

in the diagram you gave

Answer 17

oh wait, you are looking for the arc that makes total sense now, right?

Answer 18

You have to construct then! :p

Answer 19

how do you think you might find this arc? @breton

Answer 20

Theres two different questions I asked.
1) Given: DR tangent to Circle O. If m C = 63°, then m BDR =?
2) If m RDC = 120°, then m DAC =?

The DAC is the angles. D is at the bottom of the circle. YOu don't see it?

https://media.glynlyon.com/g_geo_2012/7/group179.gif

Answer 21

lol, I see it - I didn't receive your first question So let's work on 1) first

Answer 22

Alright! :)

Answer 23

I need to find out what equals BDR. And my choice is 126? I believe this is correct but I don't know if I am 100%

Answer 24

If you have an angle of 90 degrees from the center of your circle, what is the intercepted arc?
This is a quarter circle

Answer 25

RDC itself is 120'
How can BDR be 126' ?

Answer 26

You're correct, @breton

Answer 27

It is 126 degrees

Answer 28

any time you have an angle that starts at the center of the circle, the arc will have the same measurement

Answer 29

So then my second question.
If m RDC = 120°, then m DAC =?
Would this answer be 240?