Answer

  1. 25
    Solution:
    In the given figure $\angle\text{CAD}=\angle\text{EAF}$ (Vertically opposite angels)
    $∴\angle\text{CAD}=30^\circ$
    In $\triangle\text{ABD},$
    $\angle\text{ABD}+\angle\text{BAD}+\angle\text{ADB}=180^\circ$ (Angle sum property)
    $⇒(\text{x}+10)^\circ+(\text{x}^\circ+30^\circ)+90^\circ=180^\circ$
    $⇒2\text{x}+130^\circ=180^\circ$
    $⇒2\text{x}=180^\circ−130^\circ=50^\circ$
    $⇒ \text{x} = 25$
    Thus, the value of x is 25.

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