if figure 10.12 find the value of x
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This is quite simple. As the figure shows that given angles are supplementary angles,so their sum must be equal to 180°.
=>(x+30)°+(x+21)°+x°=180°
=>3x+51°=180°
=>3x=(180-51)°
=>x=(129/3)°
=>x=43°
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