* Pt = s1 + s2 + s3
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Surely you know how to find the third side of a right triangle, when you know the lengths of the other two. Find it, and then add up the lengths of the three sides to get the perimeter.
Add the lengths of each side together to get the perimeter.
By using the formula a2+b2=c2, where a is one side of the right-angled triangle and b is the other side of the right angle triangle. C stands for the hypotenuse of the right-angled triangle. Note: this formula only works for RIGHT-ANGLED TRIANGLES!!!
If ten is the hypotenuse of a right triangle, the Pythagorean theorem tells us that the other side has to be 6.
The perimeter of a 30-60-90 triangle if the hypotenuse is 3 is: 7.098