Which congruence criterion do you use in the following?
Given: ZX = RP
RQ = ZY
`anglePRQ = angleXZY`
So, `trianglePQR ~= triangleXYZ`

By applying SAS congruence rule, you want to establish that trianglePQR~= triangleFED . It is given that PQ = FE and RP = DF. What additional information is needed to establish the congruence?

Total number of students of a school in different years is shown in the following table: Prepare another pictograph of students using any other symbol each representing 50 students.Which pictograph do you find more informative? .

Faraday cage: A Faraday cage or Faraday shield lies an enclosure made of a conducting material. The fields within a conductor cancel out with any external fields, so the electric field within the enclosure is zero. These Faraday cages act as big hollow conductors you can put things in to shield them from electrical fields.Any electrical shocks the cage receives, pass harmlessly around the outside of the cage. Which of the following material can be used to make a Faraday cage?

You are given the following three lenses. Which two lenses will you use as an eye piece and as an objective to construct an astronomical telescope? Give reasons.

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do homw work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many parents were surveyed?

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do homw work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many said that they did not help?