AD and FC are perpendicular so they make a 90 degree angles. Angle BDC is equal to angle FDE so its 25. then u take 90 and subtract 25 to find the anser your looking for... so its 65
Yes. They are all correct. Good job
Answer:
The radius r of this circle as a function of the time t :

Step-by-step explanation:
Speed of the circular ripple = S = 35 cm/s
Radius of the ripple at time t = r



The radius r of this circle as a function of the time t :
