Saturday

August 30, 2014

August 30, 2014

Posted by **Tom** on Sunday, October 14, 2012 at 12:23pm.

BD perpendicular AC

The sum fo the three angles in any triangle is 180 degree.

Prove: mÚCBD = 1/2 mÚBAC

- Math -
**Tom**, Sunday, October 14, 2012 at 12:33pmangle ABC ~= angle ACB

BD perpendicular AC

The sum fo the three angles in any triangle is 180 degree.

Prove: mangle CBD = 1/2 mangle BAC

- Math -
**Reiny**, Sunday, October 14, 2012 at 12:51pmlet angle CBD = a

in trianagle ABC:

2x + y = 180

in triangle BCD

a + x = 90 or 2a + 2x = 180

then 2a + 2x = 2x + y , both equal to 180

2a = y

a = (1/2y

or

angle CBD = (1/2) angle BAC

**Related Questions**

ALGEBRA 1 - If x and 3x-10 represent the measure of the acute angles of a right ...

corollary to isosceles triangle theorem - how to prove 1)the measure of each ...

math - The sum of the measures of the angles of any triangle is 180 degrees. In...

MATHH - In a triangle ABC, angle A is 2 times angles C and angle B is 20 degrees...

Geometry help? - I'm not sure what to do on these questions. The measure of the ...

geometry - prove that The sum of the angles in any triangle is 180 degrees is ...

geometry - find the value of x in each triangle: triangle x has 1 angle at 53 ...

geometry - find the value of x in each triangle: triangle x has 1 angle at 53 ...

vertex angle - The three angles add to 180 degrees. Also , the two base angles ...

11th Grade Maths - The difference between the two acute angles of a right- ...