Question 1057122
Yes, you can.


The measure of the interior angle next to the given exterior angle is:


Interior angle = 180 - Exterior angle = 180 - 160 = 20 degrees


Then, you know two of the interior angles of the triangle, and you know that all three angles must sum to 180:


Missing interior angle + Known interior angle + 90 = 180


Missing interior angle = 180 - 90 - Known interior angle


Missing interior angle = 180 - 90 - 20 = 70 degrees