Question

4. Find the measure of a, b, c, d, and e in the following figure.​

Answer 1

d° = 40° (vertically opposite angles)

40°+c° = 180° (linear pair axiom)

c° = 140°

c° = e° = 140° (vertically opposite angles)

a° = b° (angles opposite to equal sides of an isosceles triangle are equal.)

a°+b°+40° = 180° (angle sum property)

a° = b° = 70°