Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: In this diagram, both polygons are regular. What is the value, in degrees, of the sum of the measures of angles $ABC$ and $ABD$?

[asy]
draw(10dir(0)--10dir(60)--10dir(120)--10dir(180)--10dir(240)--10dir(300)--10dir(360)--cycle,linewidth(2));
draw(10dir(240)--10dir(300)--10dir(300)+(0,-10)--10dir(240)+(0,-10)--10dir(240)--cycle,linewidth(2));

draw(10dir(300)+(-1,0)..9dir(300)..10dir(300)+dir(60),linewidth(2));
draw(10dir(300)+(-1.5,0)..10dir(300)+1.5dir(-135)..10dir(300)+(0,-1.5),linewidth(2));

label("A",10dir(240),W);
label("B",10dir(300),E);
label("C",10dir(0),E);
label("D",10dir(300)+(0,-10),E);

draw(10dir(300)+2dir(-135)--10dir(300)+dir(-135),linewidth(2));
[/asy]
user