Homework Help: Angle question

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

Quadrilateral JKLM is a rhombus. If mangleLMK = 36, find mangleKJM

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 ?

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