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.

sum of triangle = 180
sum of quadrilateral = 360

angle A=40 degrees
angle ADE=100 degrees
angle AED=40 degrees
angle EDB=80 degrees
angle DEC=140 degrees
angle B=70
angle C=70

in an isoceles triangle, the base angles are congruent.

trial and error, it works i guess

Posted by jen h on 2002-12-10 12:57:42