We are 6 students from the year 7 Maths group. We attend the Port Lincoln Primary School. Port Lincoln has a population of about 13000 and is in South Australia.

We conducted our measurements on Friday 18th March, a clear sunny day. We used a meter ruler supported by a science tripod.

A spirit level ensure our 90 degree angle. We measured every 2 minutes from 13:15 to 13:45. (South Australia has day light saving.)

We drew a triangle scaled by 1:10 ratio using a geoliner to measure the perpendicular angle. We also constructed the same triangle using a compass for the 90 degree angle. In both cases we calculated the angle to be 33 degrees.

We chose Chelsea Middle School to partner with . The central angle was 75 degrees the distance between us is 8563.65 kms. We calculated the circumference to be 41105.52 kms. The percentage error was 2.8%