### Home > GC > Chapter 11 > Lesson 11.2.1 > Problem 11-74

The moon is an average distance of

Compare that distance with the circumference of the Earth’s equator. Assume that the Earth’s radius is

miles. How many times greater than the Earth’s circumference is the distance to the moon? The formula to find the circumference of a circle is

. times greater

One way to estimate the distance between the Earth and the sun is to consider the triangle formed by the sun, Earth, and moon when the moon appears to be half-full. (See the diagram at right.) When the moon appears from earth to be half-full, it can be assumed that the moon forms a

angle with the sun and the Earth. Using special equipment, Ray found the measure of angle

to be. If the moon is miles away from the Earth, then how far is the sun from the Earth? miles