What is the perimeter of the following polygon?
50 units
48 units
47 units
46 units
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OpenStudy (anonymous):
OpenStudy (anonymous):
You should use Pythagoras theorem for this. Do you know how?
OpenStudy (anonymous):
Isn't it C=a+b ?
OpenStudy (anonymous):
No c^2 = a^2 + b^2
OpenStudy (anonymous):
Okay so c is?
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OpenStudy (anonymous):
Half the base = 8 units. Let this be a.
The line that bisects the base is 15 units and is perpendicular to base. So Pythagoras theorem can be used here to find the length of the two equal sides.
OpenStudy (anonymous):
Let 15 units be b.
Let length of the equal sides be c.
a^2 + b^2 = c^2
8^2 + 15^2 = c^2
64 + 225 = c^2
c^2 = 289
c = sqrt289
= 17
Finding the perimeter should be easy now.
OpenStudy (anonymous):
Did you get the answer?
OpenStudy (anonymous):
wait @anncandy
OpenStudy (anonymous):
I'm still working on it, I'm not very good at geometry.
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OpenStudy (anonymous):
pratu was the corect
OpenStudy (anonymous):
Is it 48units?
OpenStudy (anonymous):
No, its 50 units. You must have made some addition mistake.