What is the measure of A

Given:

A figure of a triangle.

To find:

The measure of angle A.

Solution:

Label the points in the figure as shown below.

In the below figure,

           (Vertically opposite angles)

             (Congregant angles)

Using exterior angle theorem in triangle ABC, we get

Isolate the variable term x.

Now, the measure of angle A is:

Therefore, the correct option is B.

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation: