Answer:
The missing angle is 24 degrees
Step-by-step explanation:
The two angles form a straight line so they add to 180 degrees
x+156 = 180
Subtract 156 from each side
x+156-156 = 180- 156
x = 24
The missing angle is 24 degrees
To calculate the area it is pi*r^2
so since r = 1/2 d
2.5^2 * pi = area
or
19.625