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From Karnataka Open Educational Resources
21 bytes removed ,  06:50, 15 February 2014
Line 259: Line 259:  
There are 'n' angles in a polygon of side 'n'.Out of 'n' angles 2 angles are right anles and other (n-2) angles are each.
 
There are 'n' angles in a polygon of side 'n'.Out of 'n' angles 2 angles are right anles and other (n-2) angles are each.
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(2n-4)  <math>90^0</math>              = (n-2)<math>\144^0+{2}{90}^0</math>Students know how to open the bracket and substitute the values)
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(2n-4)  <math>90^0</math>              = (n-2)<math>\144^0+(2)(90^0)how to open the bracket and substitute the values)
    
2n x - 4 x =  
 
2n x - 4 x =