The diagrams illustrate a cross section of a picture frame and the front view of two picture frames.
Overall, a picture frame consists of multiple components such as frame,glass and clips. Moreover, the front views can be different depend on the type of frames,whether it is silver or wood.
To begin with diagram A shows a cross-sectional view of the picture frame.From this view, there are glass and backing which made of wood or cardboard with picture or photograph between. The frame is added to make the glass and the backing stay in their place.Finally, clips are attached to backing for hanging the picture frame.
On the other hand, diagram B and C display the front view of silver and wood picture frames. Both frame have rectangle shapes.From the front view, silver frame has thin frame with 20cm in width and 30cm in length. However, wood frame has thick frame with 19 cm in width and 30 cm in length.
