A large isosceles triangle measuring 40 cm on each equal side

Ch 210, join with sl st to first ch to form a ring, being careful not to twist. Sc in each ch around, join. (210)

[sc 103, dec] x 2, join. (208)

[sc 67, dec] x 3, sc in next 1 st, join. (205)

[sc 100, dec] x 2, sc in next 1 st, join. (203)

[sc 65, dec] x 3, sc in next 2 st, join. (200)

[sc 98, dec] x 2, join. (198)

[sc 97, dec] x 2, join. (196)

[sc 63, dec] x 3, sc in next 1 st, join. (193)

[sc 94, dec] x 2, sc in next 1 st, join. (191)

[sc 61, dec] x 3, sc in next 2 st, join. (188)

[sc 92, dec] x 2, join. (186)

[sc 91, dec] x 2, join. (184)

[sc 59, dec] x 3, sc in next 1 st, join. (181)

[sc 88, dec] x 2, sc in next 1 st, join. (179)

[sc 57, dec] x 3, sc in next 2 st, join. (176)

[sc 86, dec] x 2, join. (174)

[sc 85, dec] x 2, join. (172)

[sc 55, dec] x 3, sc in next 1 st, join. (169)

[sc 82, dec] x 2, sc in next 1 st, join. (167)

[sc 53, dec] x 3, sc in next 2 st, join. (164)

[sc 80, dec] x 2, join. (162)

[sc 52, dec] x 3, join. (159)

[sc 77, dec] x 2, sc in next 1 st, join. (157)

[sc 76, dec] x 2, sc in next 1 st, join. (155)

[sc 49, dec] x 3, sc in next 2 st, join. (152)

[sc 74, dec] x 2, join. (150)

[sc 48, dec] x 3, join. (147)

[sc 71, dec] x 2, sc in next 1 st, join. (145)

[sc 70, dec] x 2, sc in next 1 st, join. (143)

[sc 45, dec] x 3, sc in next 2 st, join. (140)

[sc 68, dec] x 2, join. (138)

[sc 44, dec] x 3, join. (135)

[sc 65, dec] x 2, sc in next 1 st, join. (133)

[sc 42, dec] x 3, sc in next 1 st, join. (130)

[sc 63, dec] x 2, join. (128)

[sc 62, dec] x 2, join. (126)

[sc 40, dec] x 3, join. (123)

[sc 59, dec] x 2, sc in next 1 st, join. (121)

[sc 38, dec] x 3, sc in next 1 st, join. (118)

[sc 57, dec] x 2, join. (116)

[sc 56, dec] x 2, join. (114)

[sc 36, dec] x 3, join. (111)

[sc 53, dec] x 2, sc in next 1 st, join. (109)

[sc 34, dec] x 3, sc in next 1 st, join. (106)

[sc 51, dec] x 2, join. (104)

[sc 32, dec] x 3, sc in next 2 st, join. (101)

[sc 48, dec] x 2, sc in next 1 st, join. (99)

[sc 47, dec] x 2, sc in next 1 st, join. (97)

[sc 30, dec] x 3, sc in next 1 st, join. (94)

[sc 45, dec] x 2, join. (92)

[sc 28, dec] x 3, sc in next 2 st, join. (89)

[sc 42, dec] x 2, sc in next 1 st, join. (87)

[sc 41, dec] x 2, sc in next 1 st, join. (85)

[sc 26, dec] x 3, sc in next 1 st, join. (82)

[sc 39, dec] x 2, join. (80)

[sc 24, dec] x 3, sc in next 2 st, join. (77)

[sc 36, dec] x 2, sc in next 1 st, join. (75)

[sc 23, dec] x 3, join. (72)

[sc 34, dec] x 2, join. (70)

[sc 33, dec] x 2, join. (68)

[sc 20, dec] x 3, sc in next 2 st, join. (65)

[sc 30, dec] x 2, sc in next 1 st, join. (63)

[sc 19, dec] x 3, join. (60)

[sc 28, dec] x 2, join. (58)

[sc 27, dec] x 2, join. (56)

[sc 16, dec] x 3, sc in next 2 st, join. (53)

[sc 24, dec] x 2, sc in next 1 st, join. (51)

[sc 15, dec] x 3, join. (48)

[sc 22, dec] x 2, join. (46)

[sc 13, dec] x 3, sc in next 1 st, join. (43)

[sc 19, dec] x 2, sc in next 1 st, join. (41)

[sc 18, dec] x 2, sc in next 1 st, join. (39)

[sc 11, dec] x 3, join. (36)

[sc 16, dec] x 2, join. (34)

[sc 9, dec] x 3, sc in next 1 st, join. (31)

[sc 13, dec] x 2, sc in next 1 st, join. (29)

[sc 12, dec] x 2, sc in next 1 st, join. (27)

[sc 7, dec] x 3, join. (24)

[sc 10, dec] x 2, join. (22)

[sc 5, dec] x 3, sc in next 1 st, join. (19)

[sc 7, dec] x 2, sc in next 1 st, join. (17)

[sc 3, dec] x 3, sc in next 2 st, join. (14)

[sc 5, dec] x 2, join. (12)

[sc 4, dec] x 2, join. (10)

[sc 1, dec] x 3, sc in next 1 st, join. (7)

[sc 5, dec] x 1, join. (6)

Sc in each st around, join. (6)

Sc in each st around, join. (6)

Fasten off leaving a long tail. Weave the tail through the front loop of each of the remaining 6 st and pull tight to close. (0)