Concept explainers
Use mathematical induction to prove this formula for a general n -sided

Answer to Problem 76E
Proved
Explanation of Solution
Calculation:
Consider the given figures.
Consider triangle,
Sum of the angles, 180°=(3−2)180°
Now consider square,
Sum of the angles 360°=(4−2)180°
Sum of the angles of polygon,
540°=(5−2)180°
So that the formula for sum of the angle in regular polygon of n sides are,
(n−2)180°
Apply mathematical induction,
Let Sn: Sum of angles in a regular polygon of n sides is (n−2)180°
First prove the statement for triangle n=3
(3−2)180°=180°
Hence, formula is valid for triangle.
Now assume that formula is valid for some integer k that is,
Sk: Sum of angles in a regular polygon of k sides is (k−2)180°
Now let see Sk+1 is a valid statement,
That is you must prove sum of angles in a regular polygon of (k+1) sides is (k−1)180°
Consider the polygon of (k+1) sides
The polygon is divided in two patrs by diagonal as shown, in triangle
By induction method sum of angles in a polygon of k sides is (k−2)180°
And sum of angles in a triangle is 180°
So total sum is
(k−2)180°+180°=(k−1)180°
Hence, Proved .
Chapter 9 Solutions
EBK PRECALCULUS W/LIMITS
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