Use to unit multipliers to convert 7 ft.² to square inches

What is the approximate circumference of the circle shown below?

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?