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Given,
The line f and g are parallel lines.
a)The measure of angle 2 is 117 degree.
By exterior atlernate angle property,
The measure of angle 7 is 117 degree.
b)The measure of angle 4 is 68 degree.
By sum of adjacent angle between two parallel lines property,
The measure of angle 6 is 112 degree.
c)The measure of angle 5 is 32 degree.
By alternate interior angle property,
The measure of angle 4 is 32 degree.
d)The measure of angle 7 is 121 degree.
By corresponding angle property,
The measure of angle 3 is 121 degree.
The approximate area of the decagon with a side of 8cm comes to be 492.40 cm².
The side of the regular decagon = 8cm
<h3>What is a regular decagon?</h3>A regular decagon is a polygon with 10 sides that are equal to each other.
The area of a regular decagon with side a is:
So, the area A of the regular decagon with a side of 8cm:
A=492.40 cm²
Therefore, the approximate area of the decagon is 492.40 cm².
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