You could find Isosceles Triangle Magformers in the following sets:
- Magformers Mini Dinosaur Set 40
- Magformers Expert Set 400
- Magformers Princess 56
- Magformers My First Tiny Friends 20
- Magformers Neon Colour set 60
- Magformers Space Episode set 55
- Magformers Magic Space set 55
- Magformers Space Wow Set 22
- Magformers Sea Adventure Set 32
- Magformers Mountain Adventure Set 32
- Magformers Desert Adventure Set 32
- Magformers Jungle Adventure Set 32
- Magformers Pythagoras Set 47
- Magformers Dinosaur Set 65
- Magformers Lighted Set 55
- Magformers R/C Cruiser Set 52
- Magformers Zoo Racing Set 55
- Magformers Crawl Friends Set 55
- Magformers Math Set 87
- Magformers Creative Set 90
- Magformers Walking Dinosaur Set 81
- Magformers Power Sound Set 59
- Magformers Adventure World set 76
- Magformers Village Set 110
- Magformers Heavy Duty Set 75
- Magformers My First Play 100
- Magformers Power Vehicle Set 86
- Magformers Mastermind Set 115
- Magformers Smart Set 144
- Magformers Brain Up Set 192
- Magformers School Series Set 180
- Magformers Steam Basic Set 200
- Brain Master Set 320
- Magformers Mega Brain Set 300
- Magformers Super Steam Set 297
- Magformers Miracle Brain Set 258
- Top Builder Set 505
- Magformers Steam Master Set 293
- Magformers Basic KS1/KS2 Classroom Pack
- Magformers Maths KS1/KS2 Classroom Pack
- Magformers Basic 90 Set + Storage Box
- Magformers XL Neon 62
- Magformers Creator 60
- Magformers Basic 40 Set + Storage Box
- Magformers Iso. Triangle Set 12
- Magformers My First Forest World 32