The wall and ground make a 90 degree angle. You don't need the 13 feet at all and that is the hypotenuse it uses the wall and ground distances so its tangent because tangent is the only trigonometric function that doesn't use the hypotenuse.
Use the Pythagorean theorem to find X
A² + B² = C²
X² + 4² = 5²
X² = 5² - 4²
X² = 25 - 16
X² = 9
.: X = 3
Eugene takes 5/6 minute to
run 1 lap around the track.
=> meaning 5/6 minute = 50 seconds
because in 1 minute there are 60 seconds, so they parted this into 6
parts, 10 minutes each
=> 60 / 6 = 6 or 6/6
If he runs around the track at the same phase for ¼ hour. Find the number
of laps did Eugene run:
=> ¼ hour = 15 minutes, because in 1 hour they parted it into 4 parts.
=> So, how mnay 50 seconds are there in 15 minutes?
=> 15 minutes x 60 seconds = 900 seconds
=> 900 seconds / 50 seconds = 18
So, Eugene were able to complete 18 laps.