SOLUTION: ABC is a triangle. find the unknown angle A=60degree B=70degree C=30degree Dwhich is x=?

Question 821478: ABC is a triangle. find the unknown angle
A=60degree
B=70degree
C=30degree
Dwhich is x=?
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

given:
is a triangle
degree
degree
degree

solution:
start with definition: the sum of all angles in triangle is degrees
as you can see, angle is part of either angle ,angle , or
angle
then we have
.....plug in given values
.....solve for

...............the unknown angle

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