A surveyor is trying to find the height of a hill he/she take a sight on the top of the hill and find that the angle of elavation is 45° he/she moves a distance 250 metres on the level ground directly away from t he hill and take a second sight from this point the angle of elevation is 20° find the height of hill

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2