O – maths made easy

O

Term	Definition
obtuse angle	an angle that is greater than 90° but less than 180° $obtuse$
octagon	a polygon with 8 sides $octagon$
ordinal number	numbers that tell position: 1st, 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th, 9^th, 10^th, …
ordinate	the y-value in a coordinate (x, y)
origin	where the x and y axes meet in a number plane
origin	in rectilinear motion, the origin is when x = 0
orthogonal	involving right angles, at right angles