Question

What is the length of the support AB?

Answer 1

\[\sin \theta={Opposite side \over hypotenuse }\]\[\text {Here opposite side = 7 feet }\]
\[Sin45^o= \frac{1}{\sqrt{2}}\]
\[\frac{1}{\sqrt{2}}=\frac{7}{AB}\]

Answer 2

sin 45 = 7/AB AB = 7/sin(45)

that should help

Answer 3

\[\text{by cross multiplication}\]
\[AB=7\sqrt{2}\]

Answer 4

Thanks!