If r-squared = theta then r = ±sqrt(theta)
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T = Distance/R
Congratulations! You already have. h = S+r
If v = r * h then> r = v / h
x = r*cos(theta) y = r*sin(theta) for alpha < theta < alpha + 90 degrees where r is the radius and alpha is any angle (which determines the direction in which the quarter circle is facing).
Since area equals Pi times radius squared take and substitute what is known. 345 equals Pi times the radius squared. divide Pi into both sides for 109.8 equals the radius squared. Now take the square root of 109.8 to get an r of 10.47936 cm.