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Complete the hexagonal and star shaped Rangolies [see Fig. $ 7.53 $ (i) and (ii)] by filling them with as many equilateral triangles of side $ 1 \mathrm{~cm} $ as you can. Count the number of triangles in each case. Which has more triangles?
"
Given:
hexagonal and star shaped rangolies.
To do:
We have to fill the given rangolies with as many equilateral triangles of side $1\ cm$ as we can and count the number of triangles in each case, which has more triangles.
Solution:
Let us calculate the area of hexagon and star,
Area of hexagon$= 6\times\frac{25\sqrt 3}{4}$
Area of star shaped rangoli$=12\times\frac{\sqrt 3}{4}\times5^2$
The area of equilateral triangles with $1\ cm$ side$=\frac{\sqrt 3}{4}\times a^2$
This implies,
$\frac{\sqrt 3}{4}\ cm^2$
Therefore,
The no.of equilateral triangles with $1\ cm$ will be $=\frac{6\times\frac{25\sqrt 3}{4}}{\frac{\sqrt 3}{4}\ cm^2}$
This implies,
The no of equilateral triangles in hexagon with $1\ cm$ side$=150$
Similarly,
The area of equilateral triangles with $1\ cm$ side $=\frac{12\times\frac{\sqrt 3}{4}\times5^2}{\frac{\sqrt 3}{4}\ cm^2}$
This implies,
The no of equilateral triangles in star shaped rangoli with $1\ cm$ side$=300$
Therefore,
The triangles with side $1\ cm$ in star shaped rangoli is more in number than in hexagonal shaped rangoli.