Question

How do I solve for A in this problem?

Answer 1

pic will be uploaded

Answer 2

well,you know in this graph:

how can we find angle m?

Answer 3

well i'll prove it for you :)

Answer 4

in this graph we have M = 180 - (B1 + D2)
ok?

Answer 5

ok

Answer 6

so,
M = 180 - B1 - D2 and (180-D2) is D1 so M = D1 - B1

Answer 7

@Brialynn96

Answer 8

Ok, I think I get it a little now

Answer 9

why a little?
look at the graph again

Answer 10

i just divided B and D to B1 and B2 and D1 and D2

Answer 11

then i'll be able to prove

Answer 12

Okay, I see now

Answer 13

and when we have:

A = theta , then theta is (2) arcBC

Answer 14

sorry! theta is BC / 2!

Answer 15

not 2 x BC

Answer 16

So BC is half of theta (A)?

Answer 17

yes

Answer 18

and we have M = D1 - B1

Answer 19

and D1 = AB/2 and B1 = DC/2

Answer 20

ok

Answer 21

then
\[M = \frac{ AB - DC }{ 2 }\]

Answer 22

proved :)

Answer 23

and you can use this

Answer 24

can you do it or need help?

Answer 25

@Brialynn96

Answer 26

I think I can do it now, thank you

Answer 27

you're welcome :)