Question

What is the sum of m∠a + m∠b + m∠c?
http://secure.starssuite.com/files/geo2010/Geom_10S_Fig23.jpg

Answer 1

Angles a,b,c are all exterior angles.

http://www.mathsisfun.com/geometry/exterior-angles-polygons.html

Answer 2

all are exterior angle
and exterior angle= sum of the opposite angles of the triangle

Answer 3

like
m<a=72+43
65 is touching a it is not opposite

Answer 4

so would it be 245?

Answer 5

how u got that

Answer 6

m<b=72+65
m<c=65+43

Answer 7

check out the link

you don't have to do much in terms of work (since the theorem says they always add to one certain number)

Answer 8

or you could do this:

Answer 9

i am so confused D:

Answer 10

what are you confused about?

something about what I drew?

Answer 11

this whole problem

Answer 12

you just need to find a+b+c

you can do it my way, take little more works, but more doable for you, right?

Answer 13

so would it be 252?

Answer 14

hmm no

have you readed the link @jim_thompson5910 gave you?
http://www.mathsisfun.com/geometry/exterior-angles-polygons.html

Answer 15

oh, no my bad

Answer 16

for some reason my laptop didnt show it