its not in 8th standard syllabus

use a protractor ( D )

if u still want 2 know then google it

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To draw 110degree first take a point and constrict 90degree and now take 90degree line segment and construct 20degree
Then you will get110degree as 90+20=110
Anfd to draw 20degree
Draw a line AB.
With A as centre draw an arc cutting the line AB.Mark it as C.
With C as centre without changing the radius draw an arc cutting AB at D.
With D as centre produce the arc C.
Then, you will get that arc C and D intersect each other ,mark the intersection point as E.
Join AE . You will get 20 degree.

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