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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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BuyFindarrow_forward

Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

In regular hexagon A B C D E F , the length of A B is x centimeters. In terms of x find the length of

a) diagonal B F ¯ .
b) diagonal C F ¯ .

To determine

a) To find:

The exact length of the diagonal BF¯ of the regular hexagon ABCDEF and with AB=x cm.

Explanation

Approach:

For a right triangle, for which the measure of the interior angles 30°, 60°, and 90°; if ‘a’ is the length of measure of the shorter leg; opposite to the angle 30°, then the length of the other two sides is given by

Length of the longer leg (opposite to 60°) =a3

Length of the hypotenuse (opposite to 90°)=2a.

In general

Length of the longer leg =3× (Length of the shorter leg)

Length of the hypotenuse =2× (Length of the shorter leg)

Calculation:

Given,

A regular hexagon ABCDEF with the diagonal BF and of one of he face length measures AB=x cm.

Since, we have a regular hexagon, all the six faces are congruent and also all the six face angles,

AB=BC=CD=DE=EF=FA=x cm.

A=B=C=D=E=F=n-2·180°n

=6-2·180°6

=4·180°6

=4·30°

=120°

Thus, the measure of the length of each face of the polygon is x cm.

The measure of the each face angle of the polygon is 120°.

Here, the diagonal BF is perpendicular to the sides BC and EF of the hexagon.

Thus, the angles B and F of the ABF is given by

B=F=120°-90°

B=F=30°

Consider the ABF of the hexagon shown above and draw the auxiliary line AP¯BF¯, which will bisect both the angle A of the triangle and also the base BF of the as such ABF is an isosceles triangle with AB¯AF¯

To determine

b) To find:

The exact length of the diagonal CF¯ of the regular hexagon ABCDEF and with AB=x cm.

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