To inscribe a hexagon inside a circle, which length should you set your compass to

To inscribe a hexagon inside a circle, which length should you set your compass to
Use only your compass and straight edge when drawing a construction. No free-hand drawing!


Regular Hexagon
(inscribed in a circle)

To inscribe a hexagon inside a circle, which length should you set your compass to

A regular hexagon is a six-sided figure in which all of its angles are congruent and all of its sides are congruent.

Given: a piece of paper
Construct: a regular hexagon inscribed in a circle

 

STEPS:
1. Place your compass point on the paper and draw a circle. (Keep this compass span!)
2. Place a dot, labeled P, anywhere on the circumference of the circle to act as a starting point.
3. Without changing the span on the compass, place the compass point on P and swing a small arc crossing the circumference of the circle.
4. Without changing the span on the compass, move the compass point to the intersection of the previous arc and the circumference and make another small arc on the circumference of the circle.
5. Keep repeating this process of "stepping" around the circle until you return to point P.
6. Starting at P, connect to each arc on the circle forming the regular hexagon.

To inscribe a hexagon inside a circle, which length should you set your compass to

Full circle view:

To inscribe a hexagon inside a circle, which length should you set your compass to

To inscribe a hexagon inside a circle, which length should you set your compass to

Proof of Construction: PA = AB = BC = CD = DE since these lengths represent copies of the radius of circle O. But how do we know for sure that the last length, EP, coincided exactly with point P? Is EP actually the same length as the other copied radii?

ΔDOE is an equilateral triangle since it has 3 sides of equal length (DO and OE are radii lengths and DE is a copy of this radii length). In similar fashion, ΔCOD, ΔBOC. ΔAOB and ΔPOA are also equilateral triangles. Since the interior angles of an equilateral triangle each contain 60º, m∠COD = m∠BOC = m∠AOB = m∠POA = m∠DOE = 60º. Since all of the central angles (surrounding a point) must add to 360º, we know the m∠POE = 60º (360º - 300º = 60º).

Since

To inscribe a hexagon inside a circle, which length should you set your compass to
we have ΔDOE
To inscribe a hexagon inside a circle, which length should you set your compass to
ΔDOE by SAS. By CPCTC,
To inscribe a hexagon inside a circle, which length should you set your compass to
and we know that the last copy of the radii coincides with point P making the hexagon truly inscribed. Hexagon PABCDE has all vertices on circle O, has congruent interior angles (each equal 120º) and has all sides congruent. PABCDE is an inscribed regular hexagon by definition.

To inscribe a hexagon inside a circle, which length should you set your compass to

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2. Which length should you set your compass to inscribe a regular hexagon in a circle?
A. The diameter
C. The radius
B. Half of the radius
D. Any size in a circle 3. The given diagram is a square inscribed in a circle. What is the point of intersection of 2. Which length should you set your compass to ins - Gauthmath and \overline {GH} P A、F B. G C.H D.I 4, What is the first step in constructing a regular pentagon inscribed in a circle?
A. Draw a diameter on the center point of the circle.
B. Construct a circle with the sharp point on the center point.
C. Draw a line to connect all the vertices to form a regular pentagon.
D. Draw an arc intersecting the larger circle. 5. What is the second step in constructing a regular hexagon inscribed in a circle?
A. Draw a line to connect all the vertices to form a regular hexagon
B. Construct a circle with the sharp point on the center point.
C. Mark the first point anywhere on the circumference of the circle. D. Draw an arc across the circle creating the third point.

How do you find the length of a side of a hexagon inscribed in a circle?

The short side of the right triangle is opposite the angle at the circle's center. So if we know the measure of the angle at the center, we can use the sine function to find the side length of the hexagon, since the radius is the hypotenuse: Thus, s = 2x = 2 (r sin θ).

What tools is used to inscribe a hexagon inside a circle?

Sal constructs a regular hexagon that is inscribed inside a given circle using compass and straightedge.