King
:Help!!!!!!!.....A isosceles triangle is of height=6 cm ,perimeter=36 cm.Find its area.Please give answer with explanation
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MightySmurf
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well isosceles triangles have two sides that are equal so the 2 sides are 6
King
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how?
MightySmurf
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|dw:1320065137428:dw|
King
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i said height=6 |dw:1320065197358:dw|
King
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@mightysmurf: ure diagram is wrong
MightySmurf
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yea i messed up sorry
King
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its ok
shankvee\
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Ok see let the equal sides each be x and base be b
2*x + b=36
and x^2 =(b/2)^2 + 6^2 (Pythagoras theorem)
from the first equation x=(36-b)/2
square and substitute in the second equartion you get base =18 and x=9 hence you know the sides substitute in the formula area=1/2*base*height you get 1/2 * 18 * 6=54
King
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b=16 not 18
shankvee\
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ok yeah b=16 and side =10 sorry abt that.
shankvee\
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so area is 48 not 64.
King
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yup