Find the radius r of C.

10

Step-by-step explanation:

By Pythagoras' Theorem:

16 + r = √(24^2 + r^2)

(16 + r)^2 = 24^2 + r^2

256 + 32r + r^2 = 576 + r^2

32r = 320

r = 10

The points for the swimming event are calculated as :one point for each second the swimmer stayed under water and two points for each meter that the swimmer traveled.

Charles de Vendeville stayed under water for 68.4 seconds.

Points earned for staying under water = 68.4 (1)= 68.4

Vendeville from France travelled 60.2 meters

Points earned for traveling 60.2 meters = 60.2(2)= 120.4

Total points earned = 68.4+120.4=188.8