Question

Use the protractor to find the measure of ABC. Then classify the angle.

Answer 1

We are asked to find the measure of angle ABC and classify the angle.

As you can see from the figure, vertex A is at 30° and vertex C is at 155°

So, the angle ABC is

$\angle ABC=155\degree-30\degree=125\degree$

So, the angle ABC is 125°

Now recall that an obtuse angle is greater than 90° and less than 180°

Since 125° is between 90° and 180°, therefore, the angle ABC is an obtuse angle.

$m\angle ABC=125\degree,\quad obtuse$