Answer:
Part 1 : Equation: ( 3x - 9 ) + 30 + 24 = 180,
Part 2 : Value of x ⇒ 45°,
Part 3 : Measure of Angle U ⇒ 126°
Step-by-step explanation:
~ Part 1 ~
We know that ∑ of angles in a triangle is 180;
m∠ U + m∠ V + m∠ W = 180°,
Equation: ( 3x - 9 ) + 30 + 24 = 180
~ Part 2 ~
Now let us simplify the equation above to solve for x;
3x - 9 + 30 + 24 = 180,
3x - 9 = 126,
3x = 135,
x = 45 degrees ( ° ) ⇒
Value of x ⇒ 45°
~ Part 3 ~
If it is known that m∠ U ⇒ 3x - 9;
m∠ U = 3 * ( 45 ) - 9,
m∠ U = 135 - 9,
m∠ U = 126 degrees ( ° ) ⇒
Measure of Angle U ⇒ 126°