Right Triangle Helper
Geometry
Pythagoras, sin/cos/tan, area, perimeter.
Pick two knowns
Results
Frequently asked questions
▶What does the Right Triangle Helper do?
The Right Triangle Helper is an interactive geometry lab where you change inputs and the answers update live, helping you build intuition without doing the arithmetic by hand.
▶Who should use the Right Triangle Helper?
Students from primary to senior secondary classes, parents helping with homework, and anyone revising geometry can use this lab to check answers and explore "what-if" scenarios.
▶Is the Right Triangle Helper free to use?
Yes. Every lab on math.suparnpatra.com is free and runs entirely in your browser : nothing is sent to a server.
▶Does the Right Triangle Helper work offline?
Once the page is loaded, all calculations run locally in JavaScript, so you can keep using it even on a flaky connection.
▶How accurate are the results?
Results use standard JavaScript double-precision arithmetic and the textbook formula for geometry. We never display scientific notation : numbers are shown as ordinary decimals you can read at a glance.