dancing HEXAGON

Level pending

In a hexagon ABCDEF . Angle[AFE]=[FED]=[EDC]=[EDC]=[DCB]=[CBA]=[BAF]=120°. AB=CD=EF=3 and AF=ED=CB=6 find the area of this HEXAGON.

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2 solutions

Caleb Townsend
Feb 22, 2015

First, join F C \overline{FC} to form trapezoids A B C F ABCF and C D E F . CDEF. The area of a trapezoid is A = h × w , A = h\times w, where h h is the height and w w is the length of the median, that is w = 1 2 ( b 1 + b 2 ) . w = \frac{1}{2}(b_1 + b_2). Also, we aren't given the heights immediately, but we are given the angles in the trapezoids and slant lengths. So substitute h = l × sin θ , h = l\times\sin\theta, where l l is the slant length.

The area of A B C F ABCF is A 1 = 6 sin ( 6 0 ) 3 + 9 2 = 18 3 A_1 = 6\sin(60^\circ)\frac{3 + 9}{2} = 18\sqrt{3} The area of C D E F CDEF is A 2 = 3 sin ( 6 0 ) 6 + 9 2 = 45 3 4 A_2 = 3\sin(60^\circ)\frac{6 + 9}{2} = 45\frac{\sqrt{3}}{4}

So the area of hexagon A B C D E F ABCDEF is A = A 1 + A 2 = 117 3 4 50.66 A = A_1 + A_2 = 117\frac{\sqrt{3}}{4} \approx \boxed{50.66}

Lalit Jena
Feb 22, 2015

angle [ABC]=[BCD]=120 degree and AB=CD so angle [BAD]=[CDA]=60 degree so BC||AD in same way FC||ED so quadrilateral ABCH is a Parrallelogram so CH=AB=CD=HD=3 CM and angle [HCD]=[HDC]=[DHC]=60 degree. so triangle (ABJ) congurrent to (CHD)and(FGE) and all are equilateral triangle. (√3*(3)^2)/4=(1/2)(3)(Height) height =(3√3)/2

so area of trapezium ABCD= 1/2(6+9) (3√3)2 (45 √3)/4=11.25√3 ----------------1

AREA OF parallelogram AJEF=6*(3√3)/2 =(18√3)/2---------------------2

TRIANGLE JED is a equilateral triangle of each side of 6 CM

area of Triangle(JED)= (√3(36))/4= --------3

SUM OF 1,2AND3=AREA OF HEXAGON = 50.66

Watch out! In the picture in the problem description, you have side B C = 3 , \overline{BC} = 3, but the solution uses B C = 6. \overline{BC} = 6.

Caleb Townsend - 6 years, 3 months ago

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I am sorry Mr. Caleb Townsend I will correct my mistake!!!! :-)

Lalit Jena - 6 years, 3 months ago

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when yaar???? next year???

Sarthak Rath - 6 years, 3 months ago

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@Sarthak Rath Sarthak stop!!!

Lalit Jena - 6 years, 3 months ago

that's absolutely right... in question figure B C = 3 \overline{BC} = 3 and in answer figure Lalit Jena has used B C = 6 \overline{BC} = 6 but some how he has arrived at the correct solution!!!... silly jena...

Sarthak Rath - 6 years, 3 months ago

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I am sorry Sarthak rath!! I will correct it in some years!!!

Lalit Jena - 6 years, 3 months ago

why don't you type this in latex as i did in mine?

Sarthak Rath - 6 years, 3 months ago

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What is latex?

Lalit Jena - 6 years, 3 months ago

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look at the difference between my problems solution and yours... LaTeX is a high-quality typesetting system; it includes features designed for the production of technical and scientific documentation.

Sarthak Rath - 6 years, 3 months ago

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