A set square !
Rheostat is the name of an instrument used to vary electrical resistance.
Russian stringed musical instrument, with a triangular body and a long fretted neck fretted instrument. Usually there are three strings, which are generally plucked with a pick. The balalaika is made in various sizes, and several may be combined to make a band or orchestra.
The triangle instrument does not have a specific country of origin as it has been used in various cultures around the world. It is a simple percussion instrument consisting of a metal rod bent into a triangular shape and played by striking it with a metal beater.
syringe
Timepieces.
Yes they used for a number of reasons for examplereligious eventsfestivalsmarriagefuneralsand banquet gatheringsThey used pipes, lyre, double reed instrument, and a old model of a harp.
a compass i think
Bongos.
Telescope.
Electronic microscope
This is a very short answer, but it tells you the basics. Maths is used in science; in science, you measure amounts. Maths is used in history; you use dates. Maths is also used in geography; in geography you count population and take measurements. Maths is used in music as well; you count the beats, multiply the beats and arrange them. There are many other uses of maths in these subjects, if you don't constrain yourself to thinking that maths is STRICTLY hard arithmetic and algebraic problems you will see that maths is in everything you do. From cooking, to breathing, maths is everywhere.
Everywhere everyday you use maths for