Sphere L below in terms of its surface area is the formula: A = 4πr^2. The circumference of a circle is given by the formula: C = 2πr. The area of a circle is given by the formula: A = πr^2.
29. Find the surface area of a planet if its circumference is about 18,000 miles long: Round to the nearest thousand square miles. Solution: A = 4Ï€r^2. Given C = 18,000 miles, we can solve for r using the formula C = 2Ï€r. Rearranging the formula, we have r = C / (2Ï€). Substituting the given value, we get r = 18,000 / (2Ï€). Now we can substitute the value of r into the formula for surface area to find A.
30. Find the volume of the sphere below in terms of pi. Solution: V = (4/3)Ï€r^3. Given the radius r, we can substitute it into the formula to find the volume V.