Posted by **Jack** on Wednesday, January 5, 2011 at 3:42pm.

Two questions?

Build a patio-hypotenuese is 50 feet long

the two sides of patio are same. What is the length of one side of the patio

I think I set it up a^2 + b^2 = c^2

a^2 + b^2 = 50^2

a^2+ b^2 = 2500

then I just could say 2a^2 = 2500

a^2 = 2500/2

a^2 = 1250

sqrt of 1250 = 35.36 correct?

2nd question? Boat across a river with the current moving you downstream so the boat goes at a 30 degree angle. If the river is 400 feet across, how far downstream do you end up-this one I'm totally confused on

- Algebra -
**Reiny**, Wednesday, January 5, 2011 at 4:45pm
first question is correct.

2nd:

The way I read your question ....

drew a line straight across, called it 400 ft

then from starting point drew a line 30° from the 400 line.

got a right-angled triangle, called the distance downstream x ft

tan 30° = x/400

x = 400 tan 30°230.94

- Algebra-please recheck Reiny -
**Russ**, Wednesday, January 5, 2011 at 5:04pm
I'm not sure I'm understanding the x=

400 tan 30 *230.94 or would it be that it equals 230.94

- typo ! Algebra -
**Reiny**, Wednesday, January 5, 2011 at 5:22pm
that's a typo

should have been

x = 400 tan 30°

= 230.94

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