Question

please tell the answer

Answer 1

Answer:

55 degrees = ∆y

Step-by-step explanation:

angle CEF=CFE{∆CEF is isocelses}

Angle CEF+CFE+ECF=180(Angle sum property)

(40)+2×angleCFE=180. (Since Angle CFE=CEF)

Angle CFE= 70

Angle CED = 180-angle CEF(Linear pair)

Angle CED = 180-70

= 110

Angle CED+y+DCE = 180(Angle sum property)

15 + 110 + angle y = 180

angle y = 180-125

= 55 degrees