Final answer:
The area of a circle with radius 40cm is approximately 5030 cm².
Step-by-step explanation:
The area of a circle is found using the formula A = πr², where r is the radius of the circle.
In this case, the radius is given as 40 cm.
Substituting the value of the radius into the formula, we get A = 3.1415927 x (40 cm)² = 5026.548 cm².
Since the question asks for the answer to be rounded to 3 significant figures, we round the result to 5030 cm².