8736 ° DBC = 2 8736 ° ABD, 8736 ° DCB = 2 * 8736 ° ACB 약 8736 ° BDC = α + 2 / 3 * 8736 ° A 알파

8736 ° DBC = 2 8736 ° ABD, 8736 ° DCB = 2 * 8736 ° ACB 약 8736 ° BDC = α + 2 / 3 * 8736 ° A 알파

8736 ° DBC = 2 8736 | ABD, 8736 | DCB = 8736 | ADC, 8736 | BDC = α + 2 / 3 8736 | A, 8736 | 8736 | A = 180 - 8736 | ABC - 8736 | ACB = 180 - 1.5 * 8736 | DBC - 1.5 * 8736 | DCB * 8736 | BDC = 180 - 8736 | DCB 는 8736 | BDC = α + 2 / 3 * 8736 | A = α + 2 / 3 / 3 * 8736 | α + 2 / 3 / 3 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *