Class 11

Math

Co-ordinate Geometry

Straight Lines

Look at the following matchstick pattern of letter $A$, the $A_{′}s$ are not separate. Two neighbouring $A_{′}s$ have two common matchsticks. Observe the pattern and find the rule that gives the number of matchsticks.

i.e. in nth figure it has 6+4(n-1) matchsticks

i.e. 2+4n