AEF and CEF are isosceles triangles with AE = EF = CE. Find ∠AFB\angle\text{AFB}.

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Worked solution

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1. Find $\angle\text{EFC}$ using the isosceles triangle CEF.

In △CEF\triangle CEF, since CE=EFCE = EF, it is an isosceles triangle.
∠EFC=∠FCE=27∘\angle\text{EFC} = \angle\text{FCE} = 27^\circ.
Since F,B,CF, B, C are collinear, ∠EFB=27∘\angle\text{EFB} = 27^\circ.

2. Find $\angle\text{FEB}$ using the exterior angle of $\triangle EFB$.

In △EFB\triangle EFB, the exterior angle at BB is ∠ABF\angle\text{ABF}.
∠FEB+∠EFB=∠ABF\angle\text{FEB} + \angle\text{EFB} = \angle\text{ABF}
∠FEB+27∘=85∘\angle\text{FEB} + 27^\circ = 85^\circ
∠FEB=85∘−27∘=58∘\angle\text{FEB} = 85^\circ - 27^\circ = 58^\circ.
Since A,B,EA, B, E are collinear, ∠AEF=58∘\angle\text{AEF} = 58^\circ.

3. Find $\angle\text{AFE}$ using the isosceles triangle AEF.

In △AEF\triangle AEF, since AE=EFAE = EF, it is an isosceles triangle.
∠AFE=180∘−∠AEF2\angle\text{AFE} = \frac{180^\circ - \angle\text{AEF}}{2}
∠AFE=180∘−58∘2=122∘2=61∘\angle\text{AFE} = \frac{180^\circ - 58^\circ}{2} = \frac{122^\circ}{2} = 61^\circ.

4. Calculate $\angle\text{AFB}$.

Since BB lies on AEAE and FCFC, the ray FBFB is between FAFA and FEFE.
∠AFB=∠AFE−∠EFB\angle\text{AFB} = \angle\text{AFE} - \angle\text{EFB}
∠AFB=61∘−27∘=34∘\angle\text{AFB} = 61^\circ - 27^\circ = 34^\circ.

Answer

34∘34^\circ

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