plz with full steps
Attachments:

Answers
Answered by
0
Answer:
4/5
Step-by-step explanation:
angle d+phi+theta =180
(sum of angles of a triangle)
thus,
angle d=90-phi
similarly,
angle a=90-theta
theta + phi + 90=180
(total angle of a straight line is 180)
theta + phi=90
theta = 90- phi
substituting in angle a
angle a = 90- 90+phi
therefore,
angle a= phi
thus,
cos phi= adjacent/hypotenuse
=4/5
Hope this helps you. If it did, please mark it as brainliest.
Similar questions