3rd 

[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

1

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 
  

I have downloaded the app but it is not working properly so,what should i do

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

10 students of Class X took part in a Mathematics quiz. If the number of girls is 4 more than the number of boys, find the number of boys and girls who took part in the quiz. (ii) 5 pencils and 7 pens together cost ` 50, whereas 7 pencils and 5 pens together cost ` 46. Find the cost of one pencil and that of one pen