Basic question at geometery

Geometry Level 2

Find the area of the shaded region if the area of the regular hexagon is 24.


The answer is 2.

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6 solutions

Assuming that the hexagon is regular, its area can be divided into 6 6 identical equilateral triangles, each of area 24 6 = 4 \frac{24}{6} = 4 .

The shaded triangular area shares a base with one of these equilateral triangles and has one-half its height. Thus it will have one-half its area, i.e., 4 2 = 2 \frac{4}{2} = \boxed{2} .

Deepak Kumar
Nov 27, 2014

divide the hexagon to three parallelogram and then divide one of the parallelogram in two equal part and then the resultant part to half.so

intially area is divided to 24/3 =8 and each parallelogram divided to half of area so 8/2 =4 and then that sectional area to half you will get 4/2 =2 that the result of the given ques

Renah Bernat
Nov 27, 2014

Just assume that the hexagon is regular (because there is nothing that says anything to the contrary) and divide the hexagon into 6 equilateral triangles, each with an area of 4. Since the shaded triangle shares the base with one of the triangles and has one half its height the area thus becomes 2.

Area of the hexagon = 6*( sqrt(3)/4) a^2 = 24, which gives a^2 = 16/sqrt(3).

Area of the shaded region = (1/2)* a* (a/2)* sin(60) = (sqrt(3)/8) a^2 = (sqrt(3)/8) (16/sqrt(3)) = 2

Noel Lo
Jul 21, 2017

The pink area is half the area of one of the six identical triangles the hexagon can be divided into. Since each triangle is one-sixth the area of the hexagon, the pink area is 1 2 × 1 6 = 1 2 × 6 = 1 12 \frac{1}{2}\times\frac{1}{6}=\frac{1}{2\times 6}=\frac{1}{12} the area of the hexagon, which is 24 12 = 2 \frac{24}{12}=\boxed{2}

Using the area A of the hexagon (24), find the length of the sides using the formula:
s = 3 1 / 4 × s q r t 2 A / 9 = 3 1 / 4 × s q r t 2 ( 24 ) / 9 = 3.03934 s = 3^{1/4} \times sqrt 2A/9 = 3^{1/4} \times sqrt 2(24)/9 = 3.03934
Then, find the apothem of the hexagon (note: the apothem is the distance the center to the midpoint of side) using the formula:
a p o t h e m = s / ( 2 t a n × 180 / n ) apothem = s/ (2tan\times 180/n) where n is the number of sides of the polygon so, a p o t h e m = 3.03934 / ( 2 t a n × 180 / 6 ) = 2.64 apothem = 3.03934/ (2tan\times 180/6) = 2.64
After that, multiply the side to the apothem (this is to determine half area (a) of the rhombus that will be produce by connecting 2 midpoints to 2 corners of the hexagon).
a = 3.03934 × 2.64 = 8.024 a = 3.03934 \times 2.64 = 8.024 Then subtract the a to half of A.
12 8.024 = 3.98 12 - 8.024 = 3.98
Then divide it by 2 to get the answer 3.98 / 2 = 1.99 o r 2 3.98/2 = 1.99 or 2






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