Name the similar triangles. triangles CBA and FED with angle D congruent to angle A and angle F congruent to angle C

ΔABC ~ ΔDEF
ΔABC ~ ΔEFD
ΔABC ~ ΔDFE
ΔABC ~ ΔFED

If the value of cos330°is√3/2 then find cos 165°.

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

The longer leg of a 30-60-90 trangle is 18