Question 36505
A tower is 275 feet high. From it's top, the angle of depression to a rock on the ground is 25degrees. Find the distance from the base of the building of the the tower to the rock.
LET BT BE THE TOWER WITH B ON THE GROUND AND T THE TOP.
BT=275
LET THE ROCK ON GROUND BE AT R.
TRIANGLE BTR IS RIGHT ANGLED AT B.
ANGLE TBR=90
ANGLE BRT=25
TAN(25) =BT/BR=275/BR
BR =275/TAN(25)=590