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Find the area of a regular hexagon (in cm2) with sides of length 6 cm.
36
543
18
52
543
Remember that a regular hexagon is made of 6 equilateral triangles, each with area (√3/4)a². Multiply this by 6 to get (3√3/2)a². For a=6, area = 6 × (√3/4) × 36 = 54√3.
Regular hexagon side length a = 6 cm.
Area=233×a2
Remember that a regular hexagon is made of 6 equilateral triangles, each with area (√3/4)a². Multiply this by 6 to get (3√3/2)a². For a=6, area = 6 × (√3/4) × 36 = 54√3.
Students often use the formula for a square (a²) or fail to multiply by 6 for the 6 equilateral triangles.
Identify the formula
The area of a regular hexagon with side length a is derived from 6 equilateral triangles of side a, given by the formula Area=6×43a2=233a2.
Area=233a2
Substitute the side length
Substitute a=6 into the formula: Area=233×(6)2.
Area=233×36
Calculate the final area
Simplify the expression: Area=33×236=33×18=543.
Area=543 cm2
B is correct because the calculation for a regular hexagon with side 6 cm results in 54√3 cm².
This concept frequently appears in 3D geometry problems involving hexagonal prisms, where you multiply this base area by the height.