Posted by **Blake** on Saturday, April 28, 2007 at 6:16pm.

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!!!

## Answer this Question

## Related Questions

- geometry - the base of an isosceles triangle is 18 centimeters long. The ...
- geometry - how long are the congruent legs of isosceles triangle if its base ...
- geometry - how long are the congruent legs of isosceles triangle if its base ...
- geometry - how long are the congruent legs of isosceles triangle if its base and...
- geometry - Each base of an isosceles triangle measures 42 degrees, 30'. The base...
- geometry - the base of an isoscels triangle is 4x long. the altitude to the base...
- geometry - the diagram below shoes a pennant in the shape of an isosceles ...
- geometry - An isosceles triangle has a perimeter of 147 inches.Each of the two ...
- geometry - mrs. sally needed to build a triangular platform in the shape of an ...
- GEOMETRY PLZ HELP! - Mrs.sally needed to build a triangular platform in the ...