Find mAD if CA is a diameter of circle P
AD is a curve segment, equal to angle at center * PI*CA
I really don't understand the figure you describe.
To find mAD, we need more information about the relationship between AD and CA. If there is an angle formed at point A, such as a right angle, we can use that information to determine mAD.
If AD is perpendicular to CA, forming a right angle at point A, then mAD would be 90 degrees or π/2 radians.
However, if AD is not perpendicular to CA, we would need additional information such as the lengths of AD and CA or the measures of other angles in order to determine the measure of angle DCA and ultimately find mAD.