Answer:
$856
Step-by-step explanation:
Find 7% of $800 and then add it to $800
Angle A = arctan(12/5) = 67.4 degrees
Angle A = arccos(5/13) = 67.4 degrees
yes the answer was the same
Distance around a circle is CIRCUMFERENCE
DIAMETER*PI=CIRCUMFERENCE
Answer:

Step-by-step explanation:
The formula of the circumference of a circle is
.
The length of an arch can be found by using the ratio of circumference to the arc.
First, find the circumference of the circle:

Then you find the ratio:
The length of the arc is 90/360, which is 1/4, of the circumference.
Finally, find the length of the arc:
or 
I hope this helps :)
Subtract 70 from 16, and you get 54.