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September 23, 2014

September 23, 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

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