Question

Astronomers often use triangles to compute the distance between

Earth and other planets in the solar system. The diagram below
shows how triangles are used in this process.
D
Planet
1. Triangten ABC and ABD are right triangles Where are the right angles?

Answer 1

The astronomer knows that ACB is a right angle CAB and the angle could be measured. This is enough information to compute AB using similar triangles or trigonometry.

Explanation: