Monday

December 22, 2014

December 22, 2014

Posted by **SL** on Wednesday, June 30, 2010 at 7:42pm.

- geometry -
**drwls**, Wednesday, June 30, 2010 at 8:03pmSince it is isosceles, the altitude splits it into two congruent right triangles. The base angle is

arctan(12/9) = arctan(4/3). It's a "3,4,5" right triangle. Use a table or calculator to get the angle. It's about 53 degrees

- geometry -
**Henry**, Wednesday, June 30, 2010 at 8:07pmThe altitude of an isosceles triangle

is the perpindicular bisector of the

base and devides the triangle into 2

congruent rt. triangles. Y=12=altitude, X=18/2=9= 1/2 of base.

TanB=Y/X=12/9=1.3333, B=53.13 Degrees.

**Answer this Question**

**Related Questions**

Euclidean Geometry - I am in the 10th Grade and my question is: The base of an ...

Math - The altitude of a triangle is increasing at a rate of 2500 centimeters/...

CAL - The altitude of a triangle is increasing at a rate of 2500 centimeters/...

CAL - The altitude of a triangle is increasing at a rate of 2500 centimeters/...

Calculus Please help! - The altitude of a triangle is increasing at a rate of ...

calculus - The altitude of a triangle is increasing at a rate of 3.000 ...

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 - if the base of the equilateral triangle with sides 10 centimeters ...