3. Solve the puzzle. Notice that the 4 symbols make the following math arithmetic symbols: Multiplication, Addition, Division, and Subtraction.
Using the two shapes inside and the number of sides they have, do the math.
4. Circle (0) times Square (4) = 0
Triangle (3) plus Pentagon (5) = 8
Triangle (3) divided by Triangle (3) = 1
Pentagon (5) minus Triangle (3) = 2
So change the numbers to 0812.
Pick up the key where the glowing light is and open the door with it.