Q. 4 B

# <span lang="EN-US

Let BC be height of the tree.

AB be the breadth of the river.

A be the initial position of the person

D be the final position of the person

CAB = 60° & CDB = 30° & DA = 40m

Let AB = x & BC = h

In Δ DBC

……. (1)

In Δ ABC

…… (2)

Using (1) & (2)

AB = 20m

BC =20√3 m =20×1.73 =34.6m

Height of the tree is 34.6m and width of the river is 20m.

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