Question 96427
IF THE TEACHER HASN'T EXPLAINED HOW TO SOLVE GEOMETRY PROBLEMS OR YOU DON'T HAVE A TEXT BOOK I SUGGEST YOU GET A BOOK FROM THE SCHOOL OR PUBLIC LIBRARY & DO SOME ADDITIONAL STUDYING. 
THE FORMULA FOR THIS PROBLEM IS CALLED THE PYTHAGOREAN THEORUM OR A^2+B^2=C^2
WHERE A & B ARE TWO SIDES & C IS THE HYPOTENUSE.
376^2+388^2=C^2
141,376+150,544=C^2
C^2=291920
C=SQRT291920
C=540.296" THIS IS THE LENGTH OF THE HYPOTENUSE OR THE (C) SIDE.
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I'M SORRY IT IS LATE & I AM NOT PUNCHING IN THE CORRECT NUMBERS ON MY CALCULATOR.