Given that:

ABC is an isosceles triangle in which

    AB = AC

The lengths of the following segmets are equal:

    AD
    DE
    EC
    BC

Find the measure of angle A.

You draw an extra line. (bisectrix line of an angle C)
From that, you Only prove Angle C=4 angle A). When you solved it, you think it is easy.

Posted by vohonam on 2002-06-20 08:14:17