Round 2.638 to the nearest tenth

Which triangles area would be calculated using the trigonometric area formula

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

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