The dimensions of photographs are 30cm by20cm.what length of wooden frame is needed to frame the picture?
Unless you specify some kind of border, you just have the perimeter of a rectangle with length 30 cm and width 20 cm.
Just add up the 4 sides.
Make a sketch to help you to visualize the problem.
To determine the length of the wooden frame needed to frame the picture, we need to calculate the perimeter of the photograph. The perimeter of any object is found by adding the lengths of all its sides.
In this case, the photograph has two sides measuring 30 cm and two sides measuring 20 cm. To calculate the perimeter, we add up these four lengths:
Perimeter = 30 cm + 30 cm + 20 cm + 20 cm
Perimeter = 100 cm
Therefore, the length of the wooden frame needed to frame the picture would be equal to the perimeter of the photograph, which is 100 cm.