Real answers only i am struggling and need to get this right

Consider circle h with a 3 centimeter radius. if the length of minor arc what is the measure of zrst?

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y