In addition to the right angle (V), which is known, select all the parts of the
triangle that astronomers can measure to use triangulation to find the distance
to an object.
Check all that apply.

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.