Question

In the figure, m∠B = m∠C and ∠D is a right angle.
cos B =
sin A
sin B
sin C
sin D

Answer 1

https://cdn.ple.platoweb.com/EdAssets/32a18286754f480292b60dd8b3462fb7?ts=635381466852570000

Answer 2

sin C ?

Answer 3

cos B = cos C because <B = <C

Answer 4

cos C = CD/CA

Answer 5

the sine of what angle is CD/CA?

Answer 6

C

Answer 7

No

Answer 8

sine = opposite / hypotenuse

Answer 9

CD is not opposite angle C

Answer 10

what angle is opposite side CD in triangle CDA?

Answer 11

CA?

Answer 12

doesnt B = C so sin C is CD/CA?

Answer 13

cos C = CD / CA ( adjacent / hypotenuse)

Answer 14

Ca is not the angle opposite side CD (CA is a side)

Answer 15

one approach
can you "see" the 2 triangles?
match the sides that are similar
read Cos B and then read the equivalent on the other triangle