The formula of the hypotenuse (the longest side of the triangle) is the other two lengths squared and added together.
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It is: c2-b2 = a2 whereas c is the hypotenuse, b is the base and a is the altitude
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 the hypotenuse and a leg of a right triangle are congruent to the hypotenuse and a leg of another right triangle, then the triangles are congruent.
The formula to find the hypotenuse of a right triangle is a2+b2=c2. c being the hypotenuse, a and b being the legs. So, 42+32=c2. 16+9=c2. 25=c2. c=5. The hypotenuse is 5.
Only a right triangle has a hypotenuse, and yes,when there's a hypotenuse, it's the longest side.