Question

Please help..

If m∠BAC = 55°, what is m∠DBC?

20°
80°
70°
35°

Answer 1

have u tried it yet?

Answer 2

Yes but I don't understand it at all.

Answer 3

ok, in order for evaluate m∠DBC u must find the measure of DC right?

Answer 4

Yes

Answer 5

and u know that BD=180 (half of perimeter)

Answer 6

one question: what is the measure of BC ?

Answer 7

i mean u have m∠BAC = 55° so BC=2*m∠BAC=110, am i right?

Answer 8

Yeaa

Answer 9

what happend? ok ok

Answer 10

so u can evaluate measure of CD now ... because CD and BD sum to 180 :)

Answer 11

*sum up

Answer 12

How do I find what one of those angles are equal?

Answer 13

which angles?

Answer 14

CD or BD

Answer 15

emm...those are not angles actually but the arcs (part of perimeter)

Answer 16

sorry about that, my notations are not suitable