Question

Use a protractor to draw a pentagon so that the bottom side is horizontal and the left and right sides are perpendicular to the bottom side. The angles formed at the top left and top right sides each measure 125°.

What is the measure of the fifth angle?


100º

105°

110°

115°

Answer 1

The measure of the fifth angle in the pentagon is 110°.

Polygon

A polygon is a plane figure that has a number of straight line segments connected together to form a closed shape.

Types of polygon are triangle, quadrilateral, pentagon.

A pentagon has 5 sides and the sum of angles in a pentagon is 540°. Hence, let x represent the fifth angle:

x + 90 + 90 + 125 + 125 = 540

x = 110°

The measure of the fifth angle in the pentagon is 110°.

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