So The line segment D to B is a 180 line. But we all know that C is 70 deg. To get the degree measurement inside the triangle, alternative to the value of C, you have to subtract 180 and 70 to get 110.
Now add 110 to 20 and get 130
need value of B or x subtract 190 from 130 to get 50
Answer : D Line segment D to B is a 180 degree line. We know that C is 70 degrees. To get the degree measurement inside the triangle, alternative to the value of C, you have to subtract 180 and 70 to get 110. Now we know that the missing value next to angle C is 110. We are also given the value of angle A, 20 degrees. We know that a triangle has a total of 180 degrees. We add 110 and 20 together to get 130. We want the kids in value of angle B, in other words x. Therefore we subtract 180 and 130 to get 50.
