Answer:
Step-by-step explanation:
A= 30
B= 60
C= 90
A is already shown.
B has a right angle making it 90 degrees.
A triangle is 180 degrees 30+90= 120
180-120=60
Standard deviation (s): 2.7386127875258
25π
1) for whole circuit: A=π*r², where r - radius of the given circle;
2) for a quater of the circuit: A=πr²/4;
3) finally, A=π*100/4=25π.
116.62m
