7 calculators
Triangles
Triangle solving and Pythagorean theorem calculators.
Calculators
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Double Angle Calculator
Compute sin(2θ), cos(2θ), and tan(2θ) with double-angle identities from an angle, known sine, known cosine, or known tangent plus quadrant.
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Half Angle Calculator
Compute sin(θ/2), cos(θ/2), and tan(θ/2) using half-angle identities from an input angle in degrees or radians.
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Herons Formula Calculator
Find triangle area from 3 sides using Heron's formula, then review the semi-perimeter, perimeter, inradius, circumradius, and altitude measures.
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Law of Cosines Calculator
Solve a triangle using the law of cosines — find a missing side from two sides and the included angle, or find an angle from three sides.
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Law of Sines Calculator
Solve a triangle using the law of sines — find missing sides or angles from a known side-angle pair and one additional measurement.
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Pythagorean Theorem Calculator
Solve for a missing hypotenuse or leg, or check whether three sides form a right triangle with this Pythagorean theorem calculator.
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Triangle Calculator
Use the triangle calculator to solve general triangles, right triangles, hypotenuse, isosceles and equilateral triangles, special right triangles, area.