
(a)
To find: The sum of measure of the
(a)

Answer to Problem 30WE
The sum of measures of the angles formed at the tips of five-pointed star is 180°.
Explanation of Solution
Given:
Consider a 5-point star as shown in the below figure:
The sum of the interior angles of a pentagon is always 540°.
The exterior point angle is always equal to the sum of adjacent interior angles - 180°.
The angles of the
Each interior angle of the pentagon is used twice, and there are 5 points, so
Therefore, the sum of measures of the angles formed at the tips of star is 180°.
(b)
To Find: The sum of measures of the angles formed at the tips of six-pointed star.
(b)

Answer to Problem 30WE
The sum of measures of the angles formed at the tips of six-pointed star is 360° .
Explanation of Solution
Given:
Consider a six-pointed star as shown below.
The sum is equal to 360° as it is composed of 2 triangles.
Thus, 180+180=360.
Therefore, the sum of measures of the angles formed at the tips of star is 360°.
(c)
To find: The sum of the angles measures at the tips of an n-pointed star with the help of inductive reasoning.
(c)

Answer to Problem 30WE
By inductive reasoning it is conclude that for n-pointed star, the sum of the angles formed at the tip of star is
Explanation of Solution
The sum of the angles formed at the tips of 5 pointed star is 180°, which can be written as
The sum of the angles formed at the tips of 6 pointed star is 360°, which can be written as
(d)
To justify: The formula by using deductive reasoning.
(d)

Explanation of Solution
A 6-point star is formed by 2 triangles, so the sum of the angles of two triangles is
It is given that the measurement of n vertex of the angle plus the sum of the all exterior angle equals to
There are always 2 exterior angles for n-pointed star whose sum is
The sum of the angles formed at the tips of n point star is
Chapter 3 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
Additional Math Textbook Solutions
University Calculus: Early Transcendentals (4th Edition)
Elementary Statistics (13th Edition)
Elementary Statistics: Picturing the World (7th Edition)
College Algebra (7th Edition)
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