Which one does NOT belong?

Exercise and reference answers

Questions

1. Items

   1. Tangent
   2. Chord
   3. Secant
   4. Radius

   Reason

   A tangent touches the circle at one point only. A chord, a secant and a radius all meet the circle at two points or pass inside it.

   Odd item

   Tangent

2. Items

   1. Perpendicular to radius
   2. Cuts at two points
   3. One at each point
   4. Equal from an external point

   Reason

   Cutting the circle at two points describes a secant, not a tangent. The other three are true of tangents.

   Odd item

   Cuts at two points

Instructions

Tap the item that does not belong with the rest.

Explanation