Calculate the area of the clock face. Area = 3.1416 x r 2. Calculate A, C and d | Given r Given the radius of a circle calculate the area… The formula to calculate the area of a circle, with radius $$r$$ is: $$\text{area of a circle} = \pi r^2$$. 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. This calculates the area as square units of the length used in the radius. Example. 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. 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. For a right circular cone calculator click here.. Circle Formulas. Area of a parallelogram given base and height. Formula for Area with Diameter. Circumference = 2 • π • radius = π • diameter Circle Area = π • r² = ¼ • π • d² Sphere Formulas So, for the area of a circle given diameter, use this formula: Area of a circle = π × (D × 1 / 2) 2. For a circle, sphere and cylinder calculator click here. 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. Whereas volume is the amount of space available in an object.. The radius can be any measurement of length. Area of a rhombus. 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 rectangle. However, you may see other more precise values for π, such as 3.142 or 3.14159. Remember that radius is half of diameter. Area of a square. We can derive a formula for the surface area much as we derived the formula for arc length. Area of a triangle (Heron's formula) Area of a triangle given base and angles. The surface area of any given object is the area or region occupied by the surface of the object. We’ll start by dividing the interval into $$n$$ equal subintervals of width $$\Delta x$$. Example: The area of a circle with a radius(r) of 3 inches is: Circle Area … Area of a regular polygon. https://www.learntocalculate.com/calculate-surface-area-of-a-circle Area of a circle. Values of π. π is equal to approximately 3.14. Area of a parallelogram given sides and angle. In geometry, there are different shapes and sizes such as sphere, cube, cuboid, cone, cylinder, etc. Area of a cyclic quadrilateral. Surface area and volume are calculated for any three-dimensional geometrical shape. 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