To find: surface area of the silver bead.
Answer to Problem 9PPS
The surface area of the cone is
Explanation of Solution
Given:
Formula used:
The lateral area L of a cone is
The surface area S of a cone is S = L + B.
Calculation:
The given figure is a cone.
The objective is to find the lateral and surface area of the cone.
Find the lateral area of the cone as shown below:
Since radius is half the diameter of a
4.5 mm
Substitute r = 4.5 and l = 19.5 in the lateral area formula to find the lateral area of the cone.
Thus,
Therefore, the lateral area of the cone is approximately
Find the surface area of the cone.
The area B of the cone is,
Substitute B = 63.585 and L = 275.535 in the surface area formula to find the surface area of the cone.
Conclusion:
Therefore, the surface area of the cone is
Chapter 12 Solutions
Pre-Algebra, Student Edition
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