Circle Surface Area - Math Online Tutoring

Circle Surface Area - Math Online Tutoring A circle is set of all the points that are in the same plane and equidistant from a central point. The radius of acircle is a line segment that joins center of the circle and any point on the circle. The circle surface area isthe space occupied by the circle. Therefore the formula to calculate surface area of a circle is r2. Surfacearea is also simply called area of the circle. This surface area is a very useful tool and may be betterexplained by the following examples. Example 1: Find the surface area of a circle. The radius of the circle is 30 cm. Solution: For the given problem Radius of the circle r = 30 m. Surface area of a circle = r2 When we replace the value of radius, we get, Surface Area = x 30 x 30 = 3.14 x 900 = 2826 m2. The Surface area of the circle will be 2826 m2. Example 2: A circular tank needs to be painted black. Find area of the cover of a circular tank. Theradius of the tank is 10 m. Solution: For the given problem Radius of the tank r = 10 m Surface area of the cover of tank = r2 When we replace the value of the radius, we get; Surface Area = 3.14 x 10 x 10 = 314 m2 Surface area of the cover of circular Tank is 314 m2