- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Triangle Area Calculator (SAS)Calculate the area of a triangle from two sides and their included angle (SAS) using Area = Ā½Ā·aĀ·bĀ·sin(C). Fast, accurate, free.
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Triangle Angle CalculatorFind all three angles of a triangle from its three side lengths using the law of cosines. Free SSS triangle angle calculator with worked example.
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Triangle Inequality Theorem CalculatorCheck if three side lengths can form a valid triangle using the triangle inequality theorem: a+b>c, a+c>b, and b+c>a.
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Similar Triangles CalculatorFind the scale factor between similar triangles, then compute corresponding sides and the area ratio (kĀ²). Fast, accurate, with worked examples.
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Pythagorean Triples CalculatorGenerate Pythagorean triples (a, b, c) from two integers m and n using Euclid's formula a=mĀ²ānĀ², b=2mn, c=mĀ²+nĀ². Verifies aĀ²+bĀ²=cĀ² instantly.
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Right Triangle Side and Angle CalculatorFind the hypotenuse, angles, area and perimeter of a right triangle from its two legs using the Pythagorean theorem and trigonometry.
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Heron's Formula CalculatorCalculate the area of any triangle from its three side lengths using Heron's formula. Instantly get the area, semi-perimeter, and perimeter.
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Perimeter of a Triangle CalculatorCalculate the perimeter of a triangle from its three side lengths instantly. Uses P = a + b + c and also shows the semi-perimeter.
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Circumscribed Circle CalculatorFind the circumradius of a triangle from its three sides. Computes R = abc/(4Ā·Area) using Heron's formula, plus diameter, circumference and circle area.
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Area of an Obtuse Triangle CalculatorFind the area of an obtuse triangle using base and height or Heron's formula from three sides. Free, instant, and accurate online calculator.
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Angle of Right Triangle CalculatorFind the acute angle of a right triangle from any two sides using arctan, arcsin, or arccos. Get the result in degrees and radians instantly.
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Area of an Oblique Triangle CalculatorFind the area of any oblique triangle from two sides and the included angle using Area = Ā½Ā·aĀ·bĀ·sin(C). Fast, accurate SAS area calculator.
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Triangle Area Calculator (3 Sides ā Heron's Formula)Calculate the area of any triangle from its three side lengths using Heron's formula. Get area, semi-perimeter and perimeter instantly.
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Triangle Height CalculatorCalculate triangle height easily with base length and area input. Determine the vertical distance from the base to the opposite vertex accurately for your geometric calculations.
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Angle Bisector Theorem CalculatorUse the Angle Bisector Theorem to split side BC into segments BD and DC proportional to the adjacent sides AB and AC. Free, instant geometry solver.
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Scalene Triangle Solver CalculatorSolve any general triangle from 14 input combinations of sides, angles, height or area. Get all three sides, all angles, the altitude and area instantly.
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Isosceles Triangle CalculatorSolve every element of an isosceles triangle from any two known values: base, equal legs, height, base angle, apex angle or area. Free online solver.
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Right Triangle SolverSolve a right triangle from any two known elements. Enter base, height, hypotenuse, base angle or area and get all remaining sides, the angle and area.
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Isosceles Right Triangle CalculatorCalculate the hypotenuse, area, and perimeter of an isosceles right triangle from its leg length using a=a, hyp=aā2, area=aĀ²/2.
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ASA Triangle CalculatorSolve an ASA triangle from two angles and the included side. Get the third angle, all sides, perimeter, and area using the law of sines.
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Equilateral Triangle Area CalculatorCalculate the area of an equilateral triangle from its side length using A = (ā3/4)Ā·aĀ². Also returns perimeter and height instantly.
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Area of a Right Triangle CalculatorCalculate the area of a right triangle from its two legs (base and height). Also returns the hypotenuse and perimeter instantly. Free online tool.
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Triangle Angles from Three Sides CalculatorCompute all three interior angles of a triangle from its side lengths, in decimal degrees and degrees-minutes-seconds, plus the height and area via Heron's formula.
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Triangle Area from One Side and Two Adjacent Angles (ASA)Compute a triangle's area, perimeter, and height from one included side and its two adjacent angles (ASA case). Supports degrees or radians.
