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Q.

In the given figures, the directed lines are parallel to each other. Find the unknown angles ∠k=[[1]], ∠y=[[2]], ∠z=[[3]] and ∠x=[[4]].


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Detailed Solution

angle x and ∠1 are co-interior angles. So, as per the property of parallel lines the sum of these two angles will be equals to 180°
seo ∠x+∠1=180°
∠1=90°  (as given)
⇒∠x+90°=180°
⇒∠x=90°
angle x, ∠2 and z are three angles of the triangle.
⇒∠x+∠z+∠2=180° (angle sum property of triangle)
∠x=90° and  ∠2=30°  (as given)
⇒90°+∠z+30°=180°
⇒120°+∠z=180°
⇒∠z=60°
⇒∠y+∠z=180
° (sum of the angles in any straight line)
⇒∠y+60°=180°  ⇒∠y=120°
⇒∠y+∠k=180° (co-interior angles)
⇒∠k+120°=180°
⇒∠k=60°
The value of all unknown angles are  ∠k=60°, ∠y=120°, ∠z=60° and ∠x=90°.
 
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In the given figures, the directed lines are parallel to each other. Find the unknown angles ∠k=[[1]], ∠y=[[2]], ∠z=[[3]] and ∠x=[[4]].