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If the pentagon is a regular pentagon, then each of the central angles (formed by joinning the center with the vertices) is72⁰ (1/5 of 360⁰). So that 5 congruent isosceles triangle are formed, with base angles of 54⁰. If we draw the height, of these triangles (from the center to the sides of the pentagon), 10 congruent right triangles are formed. Let denote with:
b the sides of the pentagon, and
h the height. In one of the right triangles we have: tan 54⁰ = h/(b/2)
tan 54⁰ = 2h/b
1.38 = 2h/b
2h = 1.38b
h = (1.38/2)b
h = .69b So that, h/b = .69b/b = .69
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What is the name of the figure with 5 sides?
pentagon a pentagon A pentagon is a Polygon with 5 sides.
Does a pentagon have perpendicular sides?
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How many sides do a hexagon and a pentagon have?
A hexagon has six sides, and a pentagon has five sides
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An octagon has 8 sides and a pentagon has 5 sides.
How many sides do a pentagon and a hexagon have?
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If the sides of a pentagon equals x what is the height?
1.78x
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4/5 0.8
What is the ratio of the length of an equilateral pentagon to its perimeter?
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What is a polygon with 5 sides?
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No, a pentagon has 5 sides.
How much sides do a pentagon has?
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How many sides do pentagon?
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What can you use for a 12 sided pentagon?
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Is a pentagon an octagon?
An octagon has 8 sides and a pentagon has 5 sides.
A pentagon and a regular pentagon have how many sides?
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What is the name of the figure with 5 sides?
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