Circumference = 2 • π • radius = π • diameter Circle Area = π • r² = ¼ • π • d² Sphere Formulas This calculates the area as square units of the length used in the radius. Values of π. π is equal to approximately 3.14. Area of a quadrilateral. The surface area of any given object is the area or region occupied by the surface of the object. Calculate the area of the clock face. Surface area and volume are calculated for any three-dimensional geometrical shape. Area of a rhombus. Surface = 2 radius X height S = 2 rh + 2 r2 Pyramid Volume = 1/3 area of the base X height V = bh b is the area of the base Surface Area: Add the area of the base to the sum of the areas of all of the triangular faces. Area of a circle: A = π r 2 = π d 2 /4 Circumference of a circle: C = 2 π r = π d. Circle Calculations: Using the formulas above and additional formulas you can calculate properties of a given circle for any given variable. On each subinterval we will approximate the function with a straight line that agrees with the function at the endpoints of each interval. Area of a trapezoid. Area of a square. Area of a parallelogram given sides and angle. Cones The result will vary from zero when the height is zero, to the full area of the circle when the height is equal to the diameter. https://www.learntocalculate.com/calculate-surface-area-of-a-circle Remember that radius is half of diameter. The areas of the triangular faces will have different formulas for different shaped bases. Find the area with this circle area formula: Multiply Pi (3.1416) with the square of the radius (r) 2. Area = 3.1416 x r 2. For a right circular cone calculator click here.. Circle Formulas. Example: The area of a circle with a radius(r) of 3 inches is: Circle Area … Area of a rectangle. For a circle, sphere and cylinder calculator click here. However, you may see other more precise values for π, such as 3.142 or 3.14159. We can derive a formula for the surface area much as we derived the formula for arc length. Area of a circle. Since the formula for the area of a circle squares the radius, the area of the larger circle is always 4 (or 2 2) times the smaller circle.Think about it: You are doubling a number (which means ×2) and then squaring this (ie squaring 2) -- which leads to a new area that is four times the smaller one. Area of a regular polygon. Since a rectangular box or tank has opposite sides which are equal, we calculate each unique side's area, then add them up together, and finally multiply by two to find the total surface area. We’ll start by dividing the interval into $$n$$ equal subintervals of width $$\Delta x$$. If you know the radius of the circle and the height of the segment, you can find the segment area from the formula below. Formula for Area with Diameter. So, for the area of a circle given diameter, use this formula: Area of a circle = π × (D × 1 / 2) 2. Example. 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