Question

Help!? AC is a diagonal of parallelogram ABCD. Which is the BCA? ( Picture Below!)

Answer 1

the measure of m<(40+BCA) and m<80 is called interior angle.
the relation is the sum of them be 180 degrees.
so, 40+m<BCA+80=180
solve for m<BCA

Answer 2

so I add 40?

Answer 3

hmmm.. let m<BCA is x.
40+m<BCA+80=180
40+x+80=180
120+x=180
subtract by 120 to both sides, gives
120+x-120=180-120
x=60

Answer 4

ohh you add then subtract from both side?

Answer 5

yes...

Answer 6

ok that explains things lol I've doing the wrong thing

Answer 7

I have one more question but it's a different type of angle so idk if I'm suppose ot use 180 still

Answer 8

nopes... :)

Answer 9

the pairs of m<FEH and 150 deg have relation "interior angle", so the sum of them must be 180. try it like ques before

Answer 10

*130 i meant, not 150

Answer 11

130 + m<FEH +180
130 subtracted form both sides is 50?

Answer 12

u are right

Answer 13

Yay! lol

Answer 14

there is typo there, it should writen 130+m<FEH=180 right ?

Answer 15

yes!

Answer 16

but ur solution it's okay :)

Answer 17

thank you!!

Answer 18

welcome