Answer: 
Step-by-step explanation:

Answer:
i don't know you find it
Step-by-step explanation:
221.56, because in order to get the area of a circle, you must use this formula: area = (pi divided by 4) x diameter squared.
In this case, area = (3.14 / 4) x (16.8 x 16.8)
Answer:
Angle ABC =40º.
Step-by-step explanation:
We know that angle ABD = 70º. We also know that angle CBD= 30º . Therefore angle ABD - angle CBD will give us the measurement of angle ABC. 70º - 30º= 40º.