Monday

September 22, 2014

September 22, 2014

Posted by **Rachel** on Monday, August 21, 2006 at 8:14pm.

In the right triangle ABC, mangleB = 90, AB = 5, and AC= 12. Find BC. Round to the nearest tenth, if necessary.

Help?

Is AB a side and AC a side? I can't tell from your description which are sides and which is the hypotenuse.

But if you have two sides,

side1^2 + side2^2 = hypotenuse^2.

Post your work if you get stuck.

Okay, I have

AB^2 + BC^2 = AC^2

5^2+BC^2=12^2

23+BC^2=144

BC^2=119

BC=10.9

Is that correct?

If BC is the hypotenuse, AC is side 5 and you are looking for side BC, yes.

OR, you could have used trig to find the angle BAC from cos angle BAC = 5/12, then sin angle BAC = side BC/12.

using a protactor to measuer the angle. tell wheter the angle is acute obtuce right or srait

what is a acute angle a obtuse angle and a reflex angle ?

- abc' -
**abc'**, Wednesday, January 1, 2014 at 1:45amabc'

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