In 60 seconds, the hand sweeps out a full circle.
Full circle is 360°
The area of circle = r^2 π
The area of this circular segment is:
A = r^2 π • 45 / 60 =
16^2 π • 15 • 3 / 15 • 4 =
256 π • 3 / 4 = 256 π • 0.75 =
192 π mm^2
The Second hand of a watch is16mm long, what area does it sweep through in 45seconds
1 answer