Step-by-step explanation:
P means the center of the circle.
any point on the circle has therefore a constant distance from the center : the radius r.
r = 5 m
what we need to find is the length of the circle arc between the 2 points that represents 90° of the overall circle (360°).
90/360 = 1/4
so, we are looking for 1/4 of the overall circle circumference :
2×pi×r × 1/4 = 2×pi×5 × 1/4 = pi×10/4 = pi×5/2 =
= 7.853981634... m ≈ 7.85 m
