The Oxford Set of Mathematical Instruments! but what was its purpose?

Thanks to Wikipedia,

"The Oxford Set of Mathematical Instruments is a set of instruments used by generations of school children in the United Kingdom and around the world in mathematics and geometry lessons. The set is marketed in over 100 countries by Helix, a company based in Stourbridge, West Midlands.

It consists of a metal tin embossed on the front with a drawing of an Oxford University College and the words 'THE HELIX OXFORD SET OF MATHEMATICAL INSTRUMENTS COMPLETE & ACCURATE' in white against a blue background.

Inside the tin there are two set squares, a 180° protractor, a 15cm ruler, a metal compass, a 9cm pencil, a pencil sharpener, an eraser and a 10mm stencil. There is also a fact sheet and glossary of mathematical terms with a school timetable printed on the back. The export version also includes a dividers."

so people after having owned this mathematical set for over four years of my high-school life until now i don't know what its used for except for the tinny pencil and eraser which i used for my graffiti art and the so called protractor for barings..so i ask ma self why does the African education system complicate shit..so can any one kindly tell me the use of the triangles n the divider and all that..