The red triangles that show a 90° counterclockwise rotation of the blue triangle are in options 1, 2, and 5.
What is a triangle?
A triangle is a three-edged polygon with three vertices. It is a fundamental form in geometry. ΔABC denotes a triangle with vertices A, B, and C.
The red triangles that show a 90° counterclockwise rotation of the blue triangle are in options 1, 2, and 5.
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