The diagram A portrays the composition of a picture frame, while the diagram B and C display the different front views of two picture frames made of two distinct materials, silver and wood,
Apparently, the picture frame made of silver is suitable for larger picture or photograph, while the wooden frame is particularly for smaller photo.
By observing the cross-section of a picture frame, it involves several components, such as two frames, the glass, a picture, the backing made of either wood or cardboard, and lastly two clips. A photograph is inserted between the glass and the backing, while two frames are placed both on top and the bottom of the structure. Additionally, the two clips are attached to frames, so as a picture frame can be hung from the wall.
By looking at the diagram B, the frame is made of silver, and has the length of 30 cm and the width of 20cm. The silver frame is obviously narrower than the frame shown in diagram C, which is made of wood with the similar length and a relatively shorter width of 19cm.
