Pythagorean theorem: find the hypotenuse
Apply the Pythagorean theorem to find the hypotenuse of a right triangle. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
A right triangle has legs of 5 cm and 12 cm. How long is the hypotenuse?
a2 + b2 = c2
Answer: 13
See one solved, step by step
A right triangle has legs of 12 cm and 16 cm. How long is the hypotenuse?
a2 + b2 = c2
📘 Worked solution
1122 + 162 = 144 + 256 = 400The two legs are the sides that form the right angle — square each and add.
2c = √(400) = 20The hypotenuse is the square root of that sum.
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