ICSE Class 9: Quadrilaterals Videos | More on angle relation in parallelograms

• prove that (a+b+c)³-a³-b³-c³=3(a+b)(b+c)(c+a)
• solve this question
  
• In the adjoining figure, equilateral
  
• abcd is a quadrilateral in which ab=ad,angle a=90 degree=angle c,bc=8cm and cd=6cm.calculate ab and area of abcd  

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