How do I use Pythagoras' Theorem to calculate the hypotenuse of a triangle?

[use of board] So, Pythagoras' theorem states that a^2+b^2=c^2. Therefore, we need to mark the triangle with a, b &c. a and b do not matter, c must be the longest edge, that creates the diagonal. Put the lengths a and b into the theorem. According to BIDMAS, you must square the numbers first, then add them together afterwards. This will give you a value for c^2. Use a calculator (or your brain) to find the square root of this number... This will leave you with c, the hypotenuse.

CT
Answered by Cathy T. Maths tutor

3430 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

What is the difference between simple and compound interest?


How do you expand and simplify (x − 6)(x + 2y)^2


Solve the simultaneous equations: 6a + b = 16 and 5a - 2b = 19


Solve algebraically the simultaneous equations, giving your answers in terms of b : 3x+by=5, x-y=-2


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning