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Euclidean Geometry

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I am in the 10th Grade and my question is: The base of an isosceles triangle is 21cm. long. The altitude to the base is 9cm. long. What is the approx. measure of a base angle of the triangle?

The tangent of that angle is 9/10.5 = 0.8571
Trigonometric tables will tell you that the angle is 40.6 degrees.

How did you get 9/10.5 from the problem?

Never mind I got it now. Thanks for the help!!!

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