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Optional: Pls explain dark matter to me

yay

Step-by-step explanation:

Dark matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total mass–energy density or about 2.241×10⁻²⁷ kg/m³.

Also may be said as,

Nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles  or high-energy randomly moving particles created soon after the Big Bang.

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step-by-step explanation:

i dont really.know

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value