Question

What is the measure of angle GCD?
73º
116º
123º
29º

Answer 1

i got 116 is that right?

Answer 2

first you find the value of y
what did you get ?

Answer 3

17

Answer 4

how, the sum of all the angles are 180(n-2), so it is 180(5-2) = 180.3= 540

Answer 5

now you add all angles to find value of y, so you have
4y+3y+11+4y+103+4y-9 = 540

Answer 6

oops i made it equal to 360

Answer 7

let me know what you get for y

Answer 8

y=29

Answer 9

good, now the other shape, angles = 360, so what do you get

Answer 10

ok now im confused

Answer 11

ok since you know the value of y, now you can find angle CDH
a straight line = 180

Answer 12

4y-9 = 4(29) - 9 (because you know that y=29)
so you have 107, so now you subtract 180 - 107

Answer 13

so CDH=60

Answer 14

or 73

Answer 15

right, 73, so now you have 3 angles
73 + 90 + 74

Answer 16

its 123!

Answer 17

correct

Answer 18

thanks(:

Answer 19

yw :)