Simply put, an expression is a formula made up of numbers, symbols, variables, and parentheses, used to calculate a result or show a certain relationship. It was first systematically studied by Alonzo Church and others in the 1930s, and now it's widely used in math calculations and computer programming.
Surface area is the total area of all the outer parts of a 3D shape. For example, for a box, it's the total area you'd get if you unfolded all the sides flat.
"Representing data" usually means converting real-world information into a binary form that computers can store, process, or transmit, focusing on encoding and structured expression; in a math or statistics context, it refers to presenting data features using lists, charts, or formulas.
Bayes' Theorem is a core formula in probability theory that describes the relationship between conditional probabilities. Its essence is using new evidence to dynamically update your initial (prior) belief about a hypothesis, which gives you the updated (posterior) probability. This theorem isn't just the foundation of Bayesian inference in statistics—it’s also widely used in areas like machine learning, medical diagnosis, and spam filtering.
A pie chart is a type of chart that uses the area of circular sectors to show the proportion of data, often used to see how each part contributes to the whole, like market share or budget allocation.
In math, multiples describe the divisibility relationship between integers. If a divided by b equals c, and a, b, and c are all non-zero integers, then a is a multiple of b and c, while b and c are factors of a. It's like a rectangle with an area of 42—if the length and width are natural numbers, 42 is a multiple of both the length and the width.
The compensation method, also called the null method, is a way to achieve high-precision measurements by adjusting a known standard amount to cancel out (compensate) the quantity being measured, allowing the system to reach a balanced state. The core idea is to create a zero-current condition in the measurement circuit to eliminate systemic errors caused by things like the internal resistance of the instrument.
The Prime Meridian is the 0° longitude line on Earth, located at the old site of the Royal Observatory in Greenwich, London. It was established as the global reference point for longitude and time calculation at the international conference in 1884.
A scalene triangle is a triangle where all three sides are of different lengths. It's the most common type of triangle, and all three angles are also different from each other.