The silica-oxygen tetrahedra is the building block of which chemical class of minerals?

Silicate minerals

Explanation:

Silicate minerals are the class of chemical minerals that make up 95% of the earth's crust. The reason for the existence of silicate minerals in large quantities in rocks that form the earth crust is because of how stable silicon is when it bonds together with oxygen. Examples of silicate or silicate minerals are Quartz, Olivine, Feldspar e.t.c.

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

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