Final answer:
To estimate the side length of a square with an area of 150 cm2, calculate the square root of the area and round to one decimal place; the estimated side length is approximately 12.2 cm.
Step-by-step explanation:
The area of a square is calculated by squaring the length of one of its sides. Given that the area of a square picture frame is 150 cm2, to find a reasonable estimate for the length of one side, we can take the square root of the area.
Using a calculator, we find that the square root of 150 cm2 is approximately 12.247 cm. However, we are asked to round this to one decimal place, therefore the length of one side is approximately 12.2 cm.