Example. In geometry, there are different shapes and sizes such as sphere, cube, cuboid, cone, cylinder, etc. Whereas volume is the amount of space available in an object.. Values of π. π is equal to approximately 3.14. For a circle, sphere and cylinder calculator click here. 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 quadrilateral. The surface area formula for a rectangular box is 2 x (height x width + width x length + height x length), as seen in the figure below:. So, for the area of a circle given diameter, use this formula: Area of a circle = π × (D × 1 / 2) 2. If you know the radius of the circle and the height of the segment, you can find the segment area from the formula below. Find the area with this circle area formula: Multiply Pi (3.1416) with the square of the radius (r) 2. 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 = 3.1416 x r 2. This calculates the area as square units of the length used in the radius. Area of a rhombus. The radius can be any measurement of length. Area of a parallelogram given sides and angle. Example: The area of a circle with a radius(r) of 3 inches is: Circle Area … Cones The formula to calculate the area of a circle, with radius \(r\) is: \(\text{area of a circle} = \pi r^2\). 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. Area of a triangle (Heron's formula) Area of a triangle given base and angles. However, you may see other more precise values for π, such as 3.142 or 3.14159. https://www.learntocalculate.com/calculate-surface-area-of-a-circle Area of a regular polygon. Area of a circle = πr 2. For a right circular cone calculator click here.. Circle Formulas. Area of a square. 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. 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. Area of a trapezoid. The areas of the triangular faces will have different formulas for different shaped bases. Area of a circle. Area of a rectangle. 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. 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