Yes, with sides 8,9 and 12 triangles can be formed.
What is the triangle?
Triangle is a shape made of three sides in a two-dimensional plane. the sum of the three angles is 180 degrees.
From the triangle property, the sum of the two sides of the triangle should be greater than the third side.
From the given data the sum of the two sides is greater than the third side.
8 + 9 > 12
17 > 12
Hence, with sides 8,9 and 12 triangles can be formed.
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