Answer:
CE = 100°
Step-by-step explanation:
Using the cofunction identity
sin x = cos(90 - x)
Given x = 20°, then 90° - 20° = 70° thus
CE - 30 = 70° ( add 30 to both sides )
Thus
sin20° = cos(100 - 30)° = cos70°
CE = 100
have a nice day!
