CAN SOMEONE HELP ME WITH THESE 4 questions please please don’t answer if u don’t know cause then I wasted my points .

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

Find the area of a parallelogram with base 15 yards and height 21 2/3

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π