Question

A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is 60o and when he moves 40 m away form the tree, the angle of elevation becomes 30o. The breadth of the river is

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

breadth of the river is 20 cm

Step-by-step explanation:

tan60 = h/x

root 3=h/x

root3 x=h

tan 30= h/40+x

1/root3=h/40+x

40+x=root3(root3 x)

40+x=3x

40=2x

x=40/2

x=20cm