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# math

+1
200
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how do you find the area of a star

Guest Apr 27, 2017
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#1
+406
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http://mathcentral.uregina.ca/qq/database/qq.09.06/s/chetna2.html

Neptune  Apr 27, 2017
#2
+61
+2

You separate the star into 5 triangles and a pentagon.

LithianNerd  Apr 27, 2017
#3
+6925
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No need to separate I got it.

Area of a star(regular) of side length a

$$\left(\dfrac{5\sqrt{10-2\sqrt5}}{8}+\dfrac{(3-\sqrt5)(\sqrt{10+2\sqrt5}+2\sqrt{5+2\sqrt{5}})}{8} \right)\cdot a^2$$

Checked. No mistakes. Just substitute and use a calculator :D

Although it is really complicated......

Anyone know what I am doing XD

MaxWong  Apr 28, 2017

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