What is the value of Measure of angle a + measure of angle b

90

Step-by-step explanation:

The degree measure of a line is (180) degrees. As per the given picture, angles (a), (b), and the (90) degree angle form a straight line. Please note that an angle with a box around it is always a (90) degree angle.

Using the given information, one can form an equation and solve for the sum of angles (a) and (b);

a + b + 90 = 180

Inverse operations,

a + b = 90

a + b = 90°

Step-by-step explanation:

a , b and the 90° angle lie on a straight line and sum to 180° , that is

a + b + 90° = 180° ( subtract 90° from both sides )

a + b = 90°

i believe the answer is the polygon, heptagon.