a bridge across a river makes an angle of 45 degree with the river .

Question

if the length of the bridge across the river is 100 meter, what is the width of the river.

Answer 1

draw rite triangel with 2 angels=45 deg

river wide=hite=base

hite^2 +base^2=diagonal^2=100^2=10,000

hite^2=10,000/2=5000

hite=root(5000)=70.71 meters