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Question Number 141972 by iloveisrael last updated on 25/May/21

Commented by Dwaipayan Shikari last updated on 25/May/21

x°+20°+(360°−140°)+90°=360°  ⇒x°=30°

$${x}°+\mathrm{20}°+\left(\mathrm{360}°−\mathrm{140}°\right)+\mathrm{90}°=\mathrm{360}° \\ $$$$\Rightarrow{x}°=\mathrm{30}° \\ $$

Commented by I want to learn more last updated on 25/May/21

90  +  x  +  20   =   140  ∴     x   +  110   =   140  ∴     x   =  140   −   110  ∴     x   =  30

$$\mathrm{90}\:\:+\:\:\mathrm{x}\:\:+\:\:\mathrm{20}\:\:\:=\:\:\:\mathrm{140} \\ $$$$\therefore\:\:\:\:\:\mathrm{x}\:\:\:+\:\:\mathrm{110}\:\:\:=\:\:\:\mathrm{140} \\ $$$$\therefore\:\:\:\:\:\mathrm{x}\:\:\:=\:\:\mathrm{140}\:\:\:−\:\:\:\mathrm{110} \\ $$$$\therefore\:\:\:\:\:\mathrm{x}\:\:\:=\:\:\mathrm{30} \\ $$

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