Question

A bird is sitting on the top a tree which is 90m. the angle of elevation of the bird, from a
point on the ground is 60°. The bird flies away from the point of observation horizontally
and remains at a constant height. After 3 sec the angle of elevation becomes 45°. Find
the speed of flying the bird.​

Answer 1

Answer:

hope this answer useful to you

Answer 2

Answer:

in triangle ABC

tan60= P/B

tan60=90/B

√3= 90/B

B = 90/√3

B = 30√3

so, AC=30√3

in triangle AED

tan45= 90/B

1/√2 = 90/ B

B= 90√2

so, AD = 90√2

AD - AC = CD

90√2 - 30√3 = 60√6