To find the distance between two small towns, an electronic distance measuring (edm) instrument is places on a hill from which both towns are visible. the distance from the edm to the towns is 4.2 miles and 4 miles and the angle between the two lines of sight is 69 degrees. find the distance between the towns to the nearest tenth of a mile.

wavelength divides in half and speed stays the same.

so easy. just google the electromagnetic waves and it’ll pop up.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west