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b. sudut DBE = 1/2 . 115 = 57,5 derajat
sudut DCE = 1/2 . 115 = 57,5 derajat
sudut APD = 180° ( sudut lurus)
jika sudut APE = 65°
maka < EPD = 180° - 65° = 115° ( < Pusat )
a. < DPE = 115°
b. < DBE = <DCE = < Keliling = 1/2 × 115° = 57,5
57,5° + 57,5° = 115°