In the coordinate (3.5, 2, -0.3), which axis does the second value correspond to?

• A. X
• B. Y
• C. Z
• D. None

Answer: (B)

In 3D space, coordinates are written in the order X, Y, Z. The first number tells how far along the X axis, the second along the Y axis, and the third along the Z axis. So for the point (3.5, 2, -0.3), the second value is 2, which is the Y coordinate. (Here x = 3.5, y = 2, z = -0.3.)