For right-angled triangles you can calculate the area by knowing the hypotenuse and the height towards it. There are multiple rules to calculate a triangle's area: SSS (side-side-side), SAS (two sides and the included angle), SSA (two sides and a non-included angle), ASA (two angles and the included side). Visual in the figure below:ĭespite the simplicity of the above equation, in specific situations you may not know these two exact measurements. The formula for the area of a triangle is height x π x (radius / 2) 2, where (radius / 2) is the radius of the base (d = 2 x r), so another way to write it is height x π x radius 2.
#Area of rectangle formula missing width series
Irregular shapes would often be broken down to a series of rectangles so that their area can be approximately calculated. It is one of the easiest figures to compute an area for. You need to take two measurements: the width and the height, and just multiply them together. The formula for the area of a rectangle is width x height, as seen in the figure below: However, since in most practical situations you need to measure both sides before you know it is a square, it might not be a huge difference, but at least it is easier to calculate. This is the simplest figure to calculate as all you need is a single measurement.
The formula for the area of a square is side 2, as seen in the figure below: Substituting b inside A a×b, we get A a (P/2a). Now insert the above equation into the equation for the area (A): The area equation is given as A a×b. paint required), in land management, agriculture, biology, ecology, and many other disciplines. To find the dimensions of a rectangle: Rewrite the perimeter equation P 2 (a+b) in terms of one of the dimensions, like so: b P/2a. square centimeters, square kilometers, square inches, square feet, square miles.Īrea calculations have applications in construction and home decoration (e.g. The result is always a squared unit, e.g. When taking measurements or reading plans, make sure all measurements are in the same units, or convert them to the same unit to get a valid result. See below for details on each individual one this area calculator supports, including the formula used.
#Area of rectangle formula missing width how to
How to calculate the area of any shape?Įach geometrical figure has a different formula for calculating its area, and different required measurements that need to be known.
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