Question

In the diagram of triangle ABC below, AB = AC. Themeasure of ZB is 40°.What is the measure of ZA?

Answer 1

we have AB=AC, therefore the measure of
`\angle B=40^(\circ)=\angle C`then

the sum of the angles of a triangle is 180°,

`\begin{gathered} \angle A=180-\angle B-\angle C \\ \angle A=180-40-40 \\ \angle A=100 \end{gathered}`

the measure of