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[28442]Worksheet_18_Area_and_Perimeter.pdfarea and perimeter

What is meant by power of a lens? You have three lenses L1, L2 and L3 of powers +10D, +5D and -10D respectively. State the nature and focal length of each lens. Explain which of the three lenses will form a virtual and magnified image of an object placed at 15 cm from the lens. Draw the ray diagram in support of your answer. 12.

In parallelogram  ABCD, two points  p and q are taken on diagonal BD such that DP = BQ show that: ∆ APB congruent ∆ CPD, AQ =  CP ,APCQ is a parallelogram

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factorise (2x-3y)3+(3y-4z)3+(4z-2x)3

find the projection of a-b on a- b where a=2.

• 1is a rational 
  

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find the equation of line passing through(3,20 which are at an angle 45 degree with the line x-2y=3