A man at the top of a watchtower knows that his eye is 86 ft. above the ground. On the level plateau supporting the tower, there is a rock known to be 500 ft. from the base of the tower. Find the measure of the angle of depression of the rock from the top of the tower.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

3,843,000 is how that would be read