"Zachary Taylor" wrote in message
...
I have a sloper that is 73 feet long.
The high end is 34 feet high, and the low end is 8 feet high.
What angle is the antenna?

It's a shame I can't figure out something I should have learned
in the 6th grade; but I don't know how to set the problem up.

Thanks,
Zack



About 21 degrees. For calculation purposes, mentally move the antenna down 8
feet. So you now have a triangle with altitude of 26 feet and a hypotenuse
of 73 feet. The sine of the angle you want is 26/73 or .3562. The cosine of
..3562 is 20.86 degrees.

If you don't frequently use what you have learned, it evaporates. I know
exactly how you feel.

73,
John - KD5YI

John Smith wrote:

About 21 degrees. For calculation purposes, mentally move the antenna down 8
feet. So you now have a triangle with altitude of 26 feet and a hypotenuse
of 73 feet. The sine of the angle you want is 26/73 or .3562. The cosine of
.3562 is 20.86 degrees.

If you don't frequently use what you have learned, it evaporates. . .

True enough -- "cosine" above should be "arcsin". The arcsin of a number
is the inverse sine, or the angle whose sine is the number. Cosine is a
different trigonometric function, defined by a ratio of different sides
than the sine.

Roy Lewallen, W7EL

"Roy Lewallen" wrote in message
...

John Smith wrote:

About 21 degrees. For calculation purposes, mentally move the antenna
down 8 feet. So you now have a triangle with altitude of 26 feet and a
hypotenuse of 73 feet. The sine of the angle you want is 26/73 or .3562.
The cosine of .3562 is 20.86 degrees.

If you don't frequently use what you have learned, it evaporates. . .

True enough -- "cosine" above should be "arcsin". The arcsin of a number
is the inverse sine, or the angle whose sine is the number. Cosine is a
different trigonometric function, defined by a ratio of different sides
than the sine.

Roy Lewallen, W7EL



I _knew_ I would screw it up! Thanks, Roy.

John