Math Must-Know 5 (Number Theory 1)

Front

Formula for lateral surface area of a triangular prism

Back

A = (a+b+c)h

Front

A number that is expressed in terms of the square root of a negative number (usually the square root of −1, represented by the letter i)

Back

Imaginary numbers

Front

The product of A and 0 is 0.

Back

Zero property of multiplication

Front

For every nonzero real number A, there is a multiplicative inverse 1/A such that A (1/A) = 1.

Back

Inverse Property of Multiplication

Front

Surface area of a sphere

Back

4πr²

Front

The sum of the angles in a triangle is always equal to what?

Back

180 degrees

Front

What is the formula for the area of a rectangle?

Back

A = length × width

Front

What is the formula for the area of a circle?

Back

A = πr²

Front

What is the definition of a prime number?

Back

A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Front

What is the definition of a composite number?

Back

A composite number is a natural number greater than 1 that is not prime, meaning it has divisors other than 1 and itself.