Math Problem Statement
TRASH CANS A cylindrical trash can is 30 inches high and has a base radius of 7 inches. A manufacturer wants to know the surface area of this trash can, including the top of the lid.
GM0205_PRT_044A-REV-72dpi.png
What is the surface area? Round to the nearest square inch.
Solution
To find the surface area of a cylindrical trash can (including its lid), we need to calculate the total surface area, which consists of:
- The lateral surface area of the cylinder.
- The area of the base (which is a circle).
- The area of the lid (which is identical to the base).
The formula for the total surface area of a closed cylinder is:
Where:
- is the radius of the base (7 inches),
- is the height of the cylinder (30 inches),
- .
Step 1: Calculate the lateral surface area
The lateral surface area of the cylinder is given by:
Substituting the values:
Step 2: Calculate the area of the base and the lid
The area of the base (which is also the lid since it's identical) is given by:
Substituting the values:
Since the cylinder has both a base and a lid, we multiply this by 2:
Step 3: Calculate the total surface area
Now, sum the lateral area and the area of the base and lid:
Final answer:
Rounding to the nearest square inch:
Would you like further details or explanations? Here are 5 related questions to explore further:
- How does changing the radius affect the total surface area of the cylinder?
- What would be the surface area if the height were doubled but the radius stayed the same?
- How would you calculate the volume of this trash can?
- If the trash can didn't have a lid, how would the surface area change?
- How does the surface area of a cylinder compare to that of a cone with the same base and height?
Tip: For any solid shape, the surface area formulas typically account for all exposed surfaces, so always check whether the object has a lid or a base.
Ask a new question for Free
By Image
Drop file here or Click Here to upload
Math Problem Analysis
Mathematical Concepts
Geometry
Surface Area
Cylindrical Shapes
Formulas
Total Surface Area of a Cylinder: A = 2πrh + 2πr^2
Lateral Surface Area: A_lateral = 2πrh
Area of the Base (Circle): A_base = πr^2
Theorems
Surface Area Theorem for Cylinders
Suitable Grade Level
Grades 7-9
Related Recommendation
Calculate the Minimal Plastic Required to Cover a Cylindrical Trash Bin
Calculate Surface Area of a Cylindrical Can of Tomato Paste
Surface Area of a Cylinder with Height 7 in and Radius 2 in
Calculate Interior Surface Area of a Cylinder with Radius 7.2 inches and Height 15 inches
Surface Area of a Cylinder with Diameter 12 cm and Height 30 cm