Answer please
 

Dear student


tanθ=rR-r-rR+r1+rR-rrR+r=rR+r-rR-rR-rR+r+r2=Rr+r2-Rr+r2R2-r2+r2=2r2R2=2r22r2        Given: R2=2r2=1tanθ=tan45°θ=45°
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