A circle has a radius of 4 ft, and an arc of length 9 ft is made by the intersection of the
circle with a central angle. Which equation gives the measure of the central angle, e?

i need a diagram

step-by-step explanation:

no

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.

what is the your question?