6 A can of soup has a 9 cm diameter and is 14 cm high. a What is the radius of the can? b Find the area of a label that wraps around the can. Answer correct to one decimal place. c What is the surface area of the can including the top and bottom of the can? Answer correct to one decimal place.
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To find the radius of the can, you simply take half of the diameter. Since the can has a diameter of 9 cm, the radius is 4.5 cm. For the area of the label that wraps around the can, you'll want to calculate the circumference of the base using the formula C = 2πr. This gives a circumference of approximately 28.3 cm when rounded to one decimal place. To find the area of the label, multiply this circumference by the height (14 cm), yielding an area of roughly 396.2 cm². To find the surface area of the can, you’ll sum the lateral area and the area of the two bases. The lateral area is calculated as 2πrh, which gives approximately 251.3 cm², and the area of the two circular bases is 2πr², equal to around 63.6 cm². Adding these together provides a total surface area of about 314.9 cm².