What is the area in square centimeters of a 25 cm by 25 cm square piston face?

• A. 625 cm^2
• B. 500 cm^2
• C. 700 cm^2
• D. 900 cm^2

Answer: (A)

Area of a square is found by multiplying the side length by itself. With a square face that has 25 cm on each side, the area is 25 cm × 25 cm = 625 cm^2. The other numbers would come from different dimensions (for example, 20 cm by 25 cm gives 500, about 28 cm by 25 cm gives 700, and 30 cm by 30 cm gives 900), but the given sides are both 25 cm, so the area is 625 cm^2.