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## iITJEE 2020 Mainsmock tests

### Homogeneous equation in two variable

Homogeneous equation in two variable i.e $ax^2 + 2hxy +by^2=0$ always represent pair of line.

### Pair of lines

Let $L_1 : a_1x +b_1y +c_1 = 0$ and $L_2 : a_2x +b_2y +c_2 = 0$ be two lines, then pair of straight line

### Area of parallelogram

The area of a parallelogram ABCD can be found by calculating area of two triangles ABD and triangle BCD.

### CLASSIFICATION - NTSE

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