A spherical water balloon has a radius of 25 centimeters. How many square meters of rubber is used to make the balloon? (Use π ≈ 3.14)
Options
A
0.0785
B
0.785
C
7.85
D
78.5
Answer & Analysis
Answer
B
Analysis
Question Analysis
This question requires calculating the surface area of a sphere and then converting the area unit from square centimeters to square meters.
The main focus is on proper application of the surface area formula and accurate unit conversion for area.
Key Concept Explanation
Use the formula to find the surface area in square centimeters.
Then, use the conversion factor 1 (since meter centimeters, so ) to convert the area to square meters.
Step - by - Step Solution
Calculate the surface area in square centimeters:
Substitute into the formula , ,
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