a sagging door 4m by5m is to be made rigid by the addition of a diagonal piece or iron bar.how long is the bar

Question

explain!

Answer 1

This is a case of the Law of Pythagoras - the square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides. So 4x4=16, 5x5=25, and the square on the hypotenuse is the sum of these, 41. The square root of 41 (by calculator) is 6.4 (approx.), so you want a bar 6.4 meters long.

Answer 2

Pythagoras, (AxA)+(BxB)=CxC
A=height
B=length
C=Diagonal
therefore:
(4x4)+(5x5)=CxC
16+25=CxC
CxC=41
C=square root of 41 (whatever that is)

Answer 3

this creates the 4-5-6 right triangle. 6m