Prove that each pair of opposite side of quadrilateral is equal then it is a parallelogram 

The locus of the point of intersection of perpendicular tangets to the hyperbola X2/16 -x2/9=1 is

Sir plzz give me important theorem of chapter 19

Sir plzz give me important theorem of chapter 19

Find the mean of the following data: Class Interval 10 – 25 25 – 40 40 – 55 55 – 70 70 – 85 85 – 100 Frequency 2 3 7 6 6 6

there is a mistake in solution.

plz check

Important questions for annual exams of class 11 science 2017-18

4x+2y+1=0

3px-3y+4=0

root 3cosec x=-2 find x

Const. A triangles ABC in which angle B is 30 %,angle C is 60% and the length of perpendicular from the vertex A to the base BC is 4.8cm

Find the area of the triangle formed by the points (8,-5),(-2,-7) and (5,1) by using Heron's formula