Mathematics

Problem

An observer

1.6\,\text{m}

tall stands on one bank of a

30\,\text{m}

wide river. The angle of elevation of the top of a tree on the opposite bank is

45^\circ

. The height of the tree, correct to one decimal place, is a)

30.0\,\text{m}

22.8\,\text{m}

31.6\,\text{m}

28.4\,\text{m}