The sine of an angle is the ratio of the length of the opposite side to the length of the hypotenuse.

An airplane is sighted at the same time
An airplane is sighted at the same time by two ground observers who are 4 miles apart and both directly west of the airplane. They report the angles of elevation as 11° and 22°...

A 25 m tower standing vertically
A 25 m tower standing vertically on a hillside casts a shadow down the hillside that is 27 m long. The angle at the tip of the shadow S, subtended by the tower is  26...

A satellite, travelling in a circular orbit
A satellite, travelling in a circular orbit 700 km above Earth, will pass directly over a tracking station at noon. The satellite takes 95 mins to complete an orbit.
a) If the antenna for a tracking station is aimed at an angle of elevation of 30 degrees, at what time will the satelite pass through the beam of the ...

What is the area of triangle ABC given that a = 4 , b = 7 , and B = 75°

sin(a+b)=

Understanding business calculus and refresh courses from alegebra.
Business calculus course.
I Would like to re-learn all the math lessons I\`ve had since the 6th grade, Mostly because i slept throughout the 6th grade to 9th grade. I\`ll be stuck in 9th grade again next year, and i don\`t want it to happen again.. (And i was watching Clannad and i suddenly got jealous of Kotomi Ichinose) yes, nerdy, i know. And i don`t care.
To prepare for the 9th grade.
Learn Laws of sine and Pythagorean Theorem.
I ned to take some test ,so i ned to learn more about 9th grade math.
Because i am in 9th grade n im supposed 2 be in the 11th grade and i was told this could catch me up.
It will help me with my son who`s entering 9th grade but struggles to understand teacher`s explanations and this will allow for him to practice at home.
I am a resource math teacher to 8th and 9th graders and I need more resources.
My daughter is in 9th grade and I don`t know how to do her math homework.
Learn cosine and sine.
Algebra - 9th grader - deciding which method to use when problem types are in random order.
I will learn the law of sines.
I am teaching special ed students algebra and geometry on grade level. I have no materials for bringing them up from 5th grade - 7th grade level to 9th grade -10th grade level.
Tutoring my 9th grade son.
I teach math to 9th grade -12th grade at a small city school in North Carolina. Knowing that each student in NC has to score levels 3 or 4 on the EOC Algebra 1 test to graduate, any real-life application type problems would be beneficial to the success of my students. Knowing also that matrces are heavily tested on the NC EOC test, this website appears that it would be helpful. Our textbooks do not offer many examples of matrices . Thank you.
In my business study program.
I am a mathematics teacher and your web site can help me making my assessments and worksheets for the pupils of my class of 8th and 9th grades.