What assumption must be made about the sun rays if you use this method of determining the circumference of a large sphere?

Based on the given details, the assumption that must be made about the sun rays if using the method of determining the circumference of a large sphere is that, the rays it emits are of a certain angle from one another and these rays would travel in parallel. These rays are not touching, therefore, its angles are the same. Hope this answer helps.

A=bxh3.2x1.8=5.76 centimeters square