Where active programs and data get temporarily stored for quick access. More RAM means better multitasking.
Reverses the undo to restore a change. Not as common as undo since mistakes are more frequent.
Shuts down and then immediately starts the computer back up. Helps resolve many issues.
The top-level folder that contains all other folders on a drive. Referred to as C:.
Combining multiple drives to improve performance and/or fault tolerance. Several types exist.
Routes data between networks. Most home “routers” are actually routers, switches, and wireless access points in one unit.
Having multiple paths for data to travel. Helps maintain connectivity if one path fails.
Malware that encrypts your files and demands payment for the decryption key. Nasty stuff.
Malware that burrows deep into your system to hide itself. Notoriously hard to detect and remove.
The number of pixels in an image or video frame. Higher resolutions mean more detail.
How many times per second a screen completely redraws itself. Higher rates mean smoother motion.
Accessing a computer over a network. Can be handy but also opens security holes if not set up right.
Loose connections can cause all sorts of quirks. Power down, unplug everything, blow out the dust, then carefully plug it all back in.
Radius is a geometric term that refers to the line segment connecting the center of a circle to any point on the circumference. For a sphere, it’s the line segment from the center of the sphere to a point on the surface, and it’s usually represented by the letter r.
Its core meaning is comparison or contest, and it can also refer to analogy, closeness, or a mathematical ratio.
The rate of change is basically a measure of how fast something is changing. In math, we often use derivatives to calculate the instantaneous rate of change accurately. In physics, for example, speed is the rate of change of position.
"Reflection" in math mainly refers to the mirror symmetry operation in geometric transformations, which means flipping points, lines, or shapes across a line (for plane reflection) or a point (for central symmetry) to create a congruent mirror image; this is a type of rigid (isometric) transformation. Also, in mathematical logic, the "reflection principle" is a deep concept in set theory about the consistency between a formal system and the models of its finite subsystems.
Reflection symmetry is just mirror symmetry; an object can perfectly overlap with its original after being flipped along a line or plane.
The core of reverse percentage calculation is using division. The formula is 'Total = Part ÷ Percentage.' This usually means if you know what percentage of a number something is, you can find the whole number.
Risk analysis is a systematic process of identifying, assessing, and managing potential risk factors. Its main parts include risk assessment, risk management, and risk information communication.
A radian is a unit for measuring angles. Simply put, it measures the size of an angle using the ratio of the arc length to the radius, and its symbol is rad. When the arc length of a circle exactly equals its radius, the central angle corresponding to that arc is 1 radian, which is roughly 57.3 degrees.
"Rocket science" isn't really the strict name of a single discipline; it's more of a casual term for rocket technology and space propulsion engineering. It refers to the broad engineering field that studies rocket design, manufacturing, launching, and how they work in a vacuum.
In math, a 'result' isn't an independent axiomatic concept; it refers to the final number, expression, or state you get after a calculation, derivation, or logical process.
Real numbers are the most basic set of numbers in math, including all rational and irrational numbers. Simply put, they are the numbers that can fill up the entire number line.
A real solution, simply put, is when the result of an equation is a real number, meaning it's a number we can find on the number line, not an imaginary number.
Rounding is a way to adjust numbers. The rule is if the last digit is 4 or less, you just drop it; if it's 5 or more, you round up.
The rate of change is the core concept that describes how fast a certain quantity changes over time, space, or other variables.
In real life, 'images' are mainly abstracted in math as 2D functions, pixel matrices, or geometric trajectories.
Rubber geometry is the popular name for the branch of mathematics called 'topology'.
In math, rotation refers to the movement of a shape turning around a fixed point by a certain angle, without changing its shape or size.
Rotational symmetry means that a shape can match up with itself after being rotated around its center by a certain angle.
A rational number is a number that can be written as the ratio of two integers (in fraction form). In math, integers and fractions are both generally called rational numbers.