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January 31, 2015

January 31, 2015

Posted by **TUHITUHI** on Thursday, August 16, 2012 at 9:15am.

- geometry -
**Reiny**, Thursday, August 16, 2012 at 9:43amgiven:

ABC is an isosceles triangle with

AB = AC ---- by definition

If AD is the median to BC

BD = CD ---- given

AD = AD --- common side

therefore triangle ABD is congruent to triangle ACD (SSS)

Therefore angle ADB = angle ADC

but angle ADB + ADC = 180

so each angle = 90°

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