4×90

4×90 is the arithmetic expression for the product of 4 and 90. The computed value is 360. In prime factorization terms, 360 = 2^3 × 3^2 × 5, making it a composite number with multiple divisors.

In geometry, 90 degrees is a right angle. Four such angles sum to 360 degrees, which is the measure of a full rotation around a point. Consequently, 360° is widely used to describe complete circles and periodic motion in two-dimensional geometry and trigonometry. A quadrantal angle is any angle that is a multiple of 90°, including 360°.

If the unit is time, 4×90 minutes equals 360 minutes, which is six hours. This illustrates how the same numerical expression can represent different physical quantities depending on the unit.

The calculation also demonstrates basic properties of arithmetic, such as associativity and the distributive nature of multiplication. For example, 4×90 can be viewed as (2^2)×(9×10) or rearranged in various equivalent ways to emphasize factorization.

360 is notable beyond simple multiplication: it is a highly composite number with many divisors and serves as a convenient basis in systems that rely on degrees of a circle or subdivisions of time and measurement. Overall, 4×90 is a compact way to express a full rotation in angular terms and a standard product in arithmetic.