AboutPrivacy-policyTerms-conditionsFaqContact

    Law of Cosines Calculator: Triangle Side & Angle Measurement Tool

    Created by Md jony islam

    Easy cosine triangle calculator

    Calculate triangle sides and angles using the law of cosines. Get instant results with step-by-step solutions for any triangle configuration. This calculator based on trigonometry uses the equation c² = a² + b² - 2ab cos(C) to find triangle measurements when a, b, c represent sides and C represents the angled connection between them. The mathematical calculator serves essential functions by determining unknown triangle measurements for situations where the Pythagorean theorem is not suitable. Using its step-by-step solution approach, this calculator delivers exact measurements for three types of applications: geometry education, land surveying, and engineering calculations.

    Triangle math helper cosines Calculator

    Law of Cosines Calculator

    Results

    Area

    -

    Perimeter

    -

    Semiperimeter

    -

    Inscribed Circle Radius

    -

    Circumscribed Circle Radius

    -

    Visual Representation

    Law of Cosines Formulas

    • Side c: c² = a² + b² - 2ab·cos(C)
    • Angle C: C = arccos((a² + b² - c²)/(2ab))
    • Area: A = ½·ab·sin(C)

    Calculation History

    Learn how we tools this below

    Add this tools to your site

    Buy me a for Source Code

    What is the Law of Cosines Calculator?

    The Law of Cosines Calculator serves as a complete trigonometric solution that addresses triangle measurement using the cosine law formula. The versatile calculator enables students and educators, as well as professionals, to solve triangles using angles and sides while standard right-triangle techniques are not suitable. The calculator accepts two different sets of triangle measurements that users provide (two sides and one angle or three sides) to determine the remaining unknown dimensions. The calculator supplies clear explanatory results that benefit students at every skill level and practical users. The calculator supports various measurement units and completes automatic unit conversions between degrees and radians.

    🙋 Try our Pythagorean Theorem Calculator . If you want to learn more about conversions using Math Calculators.

    Triangle angle finder cosine:

    The advanced functionality allows users to verify triangle inequality while generating calculations for area, perimeter, and angle measurements in all triangle shapes. Through visual representations, the calculator enables users to view dynamic scaling, which demonstrates the relationships between sides and angles. The tool enables accurate results through automated calculations for educational use and engineering applications and geometric problem-solving with an automatic elimination of complex manual computations. The book incorporates real-world examples and uses of the law of cosines in surveying alongside navigation-based tasks.

    Suggested Reading

    Frequently Asked Questions - cosine Conversion FAQs:

    How to calculate the cosine of a triangle?

    The cosine formula serves to calculate trigonometric values in triangle angles. Right triangles require the cosine ratio of the adjacent side over the hypotenuse to solve. You should apply the cosine rule when dealing with non-right triangles. Using cosine allows users to determine both sides and angles by providing known measurements.

    What is the cosine rule for 3 sides?

    The cosine rule identifies as c² = a² + b² - 2ab × cos(C). Apply this when all sides are provided or when two sides combine with their connecting angle measurement. It works for any triangle. The trigonometric equation enables users to discover either the angle or a side length that remains unknown.

    How to calculate cosine in a calculator?

    The procedure for acquiring the cosine value from a calculator involves pressing the cos button followed by the angle input. Check that the calculator operates in either degrees or radians. After entering an angle and pressing the = key, the calculator returns the cosine result. Example: cos(60°) = 0.5.

    When to use cosine rule or SOH CAH TOA?

    Apply the SOH CAH TOA tool exclusively to solve right triangles. The cosine rule proves useful when dealing with any type of triangle, especially cases where right angles do not exist. Base your preference on whether the provided information includes sides, angles, or both.

    What is cosine in math?

    The trigonometric ratio known as cosine demonstrates how angles relate to two sides within right triangles. The relation between the adjacent side length and the hypotenuse length forms this ratio. Its application allows users to determine angles and find solutions for triangle problems.

    About the Author

    Md Jony Islam

    Md Jony Islam: Multidisciplinary Engineer & Financial Expert:

    Md. Jony Islam is a highly skilled professional with expertise in electronics, electrical, mechanical, and civil engineering, as well as finance. Specializing in transformer service and maintenance for 33/11kV substations, he ensures reliable and efficient electrical systems. His mechanical engineering skills drive innovative designs, while his financial acumen supports effective project budgeting. With a strong foundation in civil engineering, he contributes to robust infrastructure development. Md. Jony Islam's multidisciplinary approach ensures efficiency, quality, and reliability across all projects.