Question

what is the sum of angles $a^\circ$+$b^\circ$?

Explanation:

Step1: Recall quadrilateral angle sum

The sum of interior angles of a quadrilateral is $360^\circ$.

Step2: Set up the equation

Let the unknown angles be $a^\circ$, $b^\circ$, $60^\circ$, and $60^\circ$. So:
$$a + b + 60 + 60 = 360$$

Step3: Simplify to find $a+b$

Combine known constants:
$$a + b + 120 = 360$$
Subtract 120 from both sides:
$$a + b = 360 - 120$$

Answer:

$240^\circ$