A right triangle has a hypotenuse = 39 cm and a side = 15 cm. What is the third side?
The third side is 36 cm long.
Consider a the side of 15 cm, b the unknown side and c the hypotenuse. Use pythagoras' theorem and plug in all your values, Solve for b.
In a right triangle, we know using Pythagorean Theorem that
In this example,
Inputting this value into the equation gives us
Solving for b gives us
If you have a calculator with you, you could simply input values.
If not, you could use simple multiplication and subtraction or some factoring methods.
Either way, the answer is