This blog notes down all key properties to remember to be able to infer and use concepts for GMAT coordinate geometry related problems. Many GMAT Data Sufficiency problems will need the know-how of the properties and formulas so that we can infer if sufficient information is available or not. Thereby knowing these properties will be key, especially for data sufficiency problems.

**Angle **Properties

One of the popular questions is if two lines are perpendicular to each other. The simplest way to check for the same is to take the dot product between the coefficients of the two lines and compute the value.

**e.g. The lines are 10x + 5y = 10 and -x + 2y = 4 **

The dot product for the coefficients comes off as 10*(-1) + 5*(2) = 0. Thus, the two lines are perpendicular to each other.

To be continued …