Home of real teaching & learning
  • Full support for teachers
  • Focus on critical thinking
  • Engaging classroom activities
  • Integrated student eBook
  • Assessed tasks / qBank
  • Practice exam questions
Find out more Download brochure

The InThinking Guarantee: Our sites are written by expert practitioners and not by AI

See our AI policy

Disclaimer: InThinking subject sites are neither endorsed by nor connected with the International Baccalaureate Organisation.

Don't miss out, find out!

Equations of Perpendicular Bisectors

Once you know how to find the equation of a straight line from a point and a gradient, you can solve problems to find the equations of perpendicular bisectors. You need to know how to find the midpoint between two points and that the gradients of perpendicular lines multiply to give -1/ We sometimes say that they are the negative reciprocal of each other.

Help