Answer:
I cant see the whole thing But I think you're right
7 girls participated only in Karate.
21 + 8 = 29
29 + 7 = 36
36 + 6 = 43
The answer is 7 meters.
Area is (pi)r^2
If we remove pi, we have 49=r^2
This means that r=7
See attached diagram.
A right triangle is formed with the 350m adjacent to the 22° angle.
We want to find the height of the triangle, the side opposite.
We can use the tangent ratio (opposite/adjacent) to find this height.
tan(22°) = x/350
Multiply each side by 350
350tan(22°) = x ≈
141.4 m