Question

I've got 2 out of 3 marks pleasee help i don't know where the 3rd one would be. thanks in advance ​

Answer 1

#a

∠XBC= 55°

[ By corresponding angles]

• Corresponding angle are the angles which hold sane relative position as another angle but somewhere else on the figure.

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#b

∵ XB and XC are equal, ∠XBC=∠BCX

Now, With angle sum property of triangle:

$\sf∠XBC+∠BCX+∠BXC=180° \\ \sf55°+55°+∠BXC=180° \\ \sf110+∠BXC=180° \\ \sf∠BXC=180°-110° \\ \boxed{ \tt∠BXC= 70°}$