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→Hints for difficult problems
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*Question Corner
*Question Corner
−= Hints for difficult problems =
+[[:File:polygon problem.odt]]= Hints for difficult problems =
+CLASS IX TOPIC POLYGONS
+ADDITIONAL PROBLEMS (problem no 3 )
+A polygon has 'n' sides .Two of it's angles are right angles and each of remaining angle isFind the value of 'n'.
+Step 1;(Students must understand the problem)
+In a polygon of side 'n' two angles are and other angles are each.We must find out value of 'n'.
+Step 2(Students know the formula for sum of angles of polygon of side 'n')
+(2n-4)right angles.
+Step 3(Sum of the angles is equal to what?)
+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.
+(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)
+2n x - 4 x =
+ = (Brings similar terms at one side of the equation)
+ = (Add and substract and simplify)
+ =
+ n = (Devide and simplify)
+ n = 7
= Project Ideas =
= Project Ideas =