I know this probably is really easy, but I simply cannot figure it out for myself. Thank you for your help in advance.

On a cube, the face diagonals AB and BC meet at vertex B. What is the degree measure of angle ABC?

With a cube, it seems that the diagonals would form right angles.

OK thanks

To determine the degree measure of angle ABC, we need to analyze the given information about a cube. In this case, we are interested in the face diagonals AB and BC meeting at vertex B.

Here's a step-by-step explanation of how to approach the problem:

Step 1: Visualize the cube
Start by visualizing a cube in your mind or draw it on a piece of paper. Since a cube has six faces and twelve edges, imagine a cube and label its vertices as A, B, C, D, E, F, G, and H. Ensure that vertex B is at the center of the cube.

Step 2: Understand what a face diagonal is
A face diagonal is a line segment connecting two non-adjacent vertices on the same face of a polyhedron (in this case, a cube). For example, in our cube, face diagonal AB connects vertex A and vertex B, which are both on the same face of the cube.

Step 3: Identify the angle of interest
We need to determine the degree measure of angle ABC. Looking at the information provided, we know that face diagonals AB and BC intersect at vertex B. Therefore, angle ABC is formed at vertex B.

Step 4: Observe the cube's properties
In a cube, all faces are identical squares. Additionally, all angles formed by the intersections of diagonals in a square are equal to 90 degrees.

Step 5: Apply the properties to the cube
Since the faces of a cube are squares, we can conclude that angle ABC is a right angle. In other words, angle ABC measures 90 degrees.

Consequently, the degree measure of angle ABC is 90 degrees.

Remember, analyzing the properties and characteristics of geometric shapes is crucial to solving geometry problems.