Question

a brigde across a rover makes an angle of 45°with a river bank . if the length of brigde across the river is 200 find the width of the river

Answer 1

let width of river be x

angle made by boat = 45°
distance travelled =200m
cos45° = x/200
1/√2 = x/200
x = 200/√2
∴x = 100√2