Question

say that a and b are the lengths of a right triangle and c is the length of the hypotenuse.
find b if a = 21 and c = 29.

Answer 1

b=20

Answer 2

So

21^2+B^2=29^2

441+B^2=841

Subtract 441 from both sies
B^2=400
B=20

Answer 3

\[c ^{2}=a ^{2}+b ^{2}\rightarrow 29^{2}=21^{2}+b ^{2}\rightarrow b ^{2}=29^{2}-21^{2}=400\rightarrow b =+\sqrt{400}=20\]