Triangle CDA is the image of triangle ABC after a 180 degree rotation around the midpoint of segment AC. Triangle ECB is the image of triangle ABC after a 180 degree rotation around the midpoint of segment BC. Explain how to use what you know about the sum of the angles in a triangle to figure out the sum of the angles of quadrilateral ABED. *

fourth month

step-by-step explanation:

it is the one with the most keychains.

sina-sinb

cosb+cosa

tana-tanb

cos0+cos x pi/3

20tan

step-by-step explanation:

its   c, f, a

step-by-step explanation:

large crystals result from very slow cooling.

evaporation of water: this would produce an evaporite which is a sedimentary rock. like a salt pan in a desert. not possible to have volcanic rocks originate this way.

crystalization in molten earth: slow cooling over time. (hundreds to millions of years)

crystalization at earth's surface: this results in fast cooling. (a few hours to a few months or years)

crystalization from cooling off hot water: that would be a hydrothermal deposit. while associated with volcanics they are not volcanic rocks themselves and usually occur fairly rapidly.