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.
#A rectangle area 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. mm, cm, meters, km, or in, ft, yd, miles. Make sure the calculation is done using the same unit - the result will also be in that unit, e.g. This is the simplest figure to calculate as all you need is a single measurement. The formula for the perimeter of a rectangle is (width + height) x 2, as seen in the figure below: This is the equivalent of adding all four sides, since opposite sides are of equal length by definition. The formula for the area of a square is side 2, as seen in the figure below:
paint required), in land management, agriculture, biology, ecology, and many other disciplines. 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.
#A rectangle area 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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