High-school math is a subject that covers a variety of topics, including trigonometry, ALGEBRA, and GEOMETRY. Trigonometry is a branch of mathematics that studies the relationships between angles and sides of triangles. ALGEBRA is a branch of mathematics that deals with the manipulation of symbols and equations. GEOMETRY is a branch of mathematics that deals with shapes, sizes, and relative positions of figures. All three of these topics are commonly taught in high-school math classes.