Math Animated™
Mathematical Introduction for Physics and Engineering
by Samuel Dagan (Copyright © 2007-2020)

Index R

radian - unit of a plane angle

radioactivity

• law, lifetime(1.2.4.4)
• differential equation and solution(2.1.4.12-13)
• mean lifetime(2.2.3.26-28)

rational

• numbers
• functions

real numbers

reduced rational number

region

• of variables
• convex

revolution

• volume around x
• volume around y
• surface around x and y

root of a function

rotation

• of an object(1.2.5.32-35)
• of coordinates(3.1.4.11-13)