Question

which systems are known as metric systems​

Answer 1

Explanation:

At first the metric system was based on two quantities: length and weight. The basic units were called the metre and the gramme. In 1866 the United States started to use the metric system, but it still is not the main US system of measurement.

Answer 2

Considered nearly synonymous with the Standard International System of Units (SI), the metric system is sometimes called the meter-kilogram-second (MKS or mks) system, although that usage is mostly deprecated. The system is based on three fundamental units: the meter (m), which quantifies displacement, the kilogram (kg), which quantifies mass, and the second (s or sec), which quantifies time.