Mathematics Grade 10 15 min

Construct a regular hexagon inscribed in a circle (Tutorial Only)

Construct a regular hexagon inscribed in a circle (Tutorial Only)

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1

Introduction & Learning Objectives

Learning Objectives Define key terms such as 'inscribed polygon', 'regular hexagon', and 'radius'. List and correctly use the required tools (compass and straightedge) for geometric constructions. Follow a precise, step-by-step process to construct a regular hexagon inside a given circle. Explain why the construction method results in a regular hexagon by relating it to the properties of equilateral triangles. Prove that the side length of a regular inscribed hexagon is equal to the radius of the circumscribed circle. Apply the construction principles to calculate the perimeter and area of the inscribed hexagon. Ever wonder why honeycombs, snowflakes, and giant basalt columns form perfect hexagonal patterns? 🐝 Let's unlock the geometric se...
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Key Concepts & Vocabulary

TermDefinitionExample Inscribed PolygonA polygon drawn inside a circle such that all of its vertices lie on the circle's circumference.A square with all four of its corners touching the inside edge of a circle. Regular HexagonA six-sided polygon where all six sides have equal length and all six interior angles are equal (each measuring 120°).A standard stop sign is a regular octagon, but a honeycomb cell is a perfect regular hexagon. RadiusA straight line segment extending from the center of a circle to any point on its circumference. The length of this segment.If a circle has a diameter of 10 cm, its radius is 5 cm. CompassA V-shaped drawing instrument used for drawing circles or arcs. One leg has a sharp point, and the other holds a pencil.Using a compass to draw a perfect circle w...
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Core Formulas

Hexagon Side-Radius Equality s = r For a regular hexagon inscribed in a circle, the length of each side (s) is exactly equal to the length of the circle's radius (r). This is the fundamental principle that makes the construction work. Central Angle of a Regular n-gon \theta = \frac{360^\circ}{n} The central angle (θ) of any regular n-sided polygon is 360° divided by the number of sides (n). For a hexagon, n=6, so the central angle is 60°. This confirms that the six triangles formed by the radii are equilateral. Area of a Regular Hexagon A = \frac{3\sqrt{3}}{2}s^2 The area (A) of a regular hexagon can be calculated using its side length (s). This formula is derived from the area of the six equilateral triangles that compose the hexagon.

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Sample Practice Questions

Challenging
The area of a regular hexagon inscribed in a circle is 54√3 cm². What is the circumference of the circle?
A.6π cm
B.36π cm
C.12π cm
D.18π cm
Challenging
A regular hexagon is inscribed in Circle A, which has a radius of 10 cm. A second hexagon is inscribed in Circle B, which has a circumference equal to the perimeter of the first hexagon. What is the radius of Circle B?
A.π cm
B.30/π cm
C.60 cm
D.10 cm
Challenging
Consider one of the six equilateral triangles (ΔOAB) formed inside the hexagon. Using the Law of Sines or Cosines, how could you prove that side s (AB) equals radius r (OA and OB) without already assuming the triangle is equilateral?
A.Using Law of Sines: s/sin(120°) = r/sin(30°)
B.Using Law of Cosines: r² = s² + r² - 2sr*cos(60°)
C.Using Pythagorean Theorem: s² = r² + r²
D.Using Law of Cosines: s² = r² + r² - 2r*r*cos(60°)

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