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Concept explainers
16. Geometry An equilateral triangle is inscribed in a circle of radius r. See the figure. Express the circumference C of the circle as a function of the length x of a side of the triangle.
[Hint: First show that .]
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To express the circumference of a circle as function of length , where is the side of an equilateral triangle inscribed in the circle.
Answer to Problem 16AYU
Solution:
Explanation of Solution
Given:
An equilateral triangle of side ‘’ is inscribed inside a circle of radius ‘’ as given below.
Calculation:
To express the circumference of a circle as function of length , where is the side of an equilateral triangle inscribed in the circle.
When an equilateral triangle is inscribed inside a circle, then the centre of the circle matches with the centroid of the triangle.
If side of the triangle then, height of the equilateral triangle .
Now, centroid of a triangle divides the height in the ratio 2:1.
Therefore, the distance between centroid to any vertices of the equilateral triangle of height of the equilateral triangle.
The circumference of the circle is .
Chapter 2 Solutions
Precalculus Enhanced with Graphing Utilities
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