A scalar is a quantity that has?

Answer 1

A scalar quantity has an angle which is an even multiple of 90 degrees.

A vector quantity has an angle which is an odd multiple of 90 degrees.

A quaternion has any angle and includes the scalar and the vector;

quaternion q = cos(angle) + unit-vector sin(angle)

Answer 2

A scalar is a quantity that has magnitude (size) only, without a specific direction. Scalars are represented by a single number value and do not have associated vector components. Examples of scalars include time, temperature, and speed.