3. Calculate the SA of a closed cylinder whose radus is 7 cm and reigitt of 2 tcom

To find the surface area (SA) of a closed cylinder, you can use the formula: SA = 2πr(h + r). Here, r is the radius and h is the height. For your closed cylinder, r = 7 cm and h = 200 cm (since 2 tcom seems to be a typo for 2 cm). Plugging in those values: SA = 2π(7)(200 + 7) = 2π(7)(207) = 2π(1449) ≈ 9115.6 cm². Now, don’t forget to keep your measurements consistent! When calculating areas and volumes, always use the same unit of measurement throughout to avoid confusions. Mismatching units can lead to wild results that have nothing to do with the original problem!