



__________________________________________
D. 6
is the correct answer.
Answer:
12 units
Step-by-step explanation:
Each side of the triangle is 1 unit. When putting 10 triangles together in figure 10, there will be 12 sides on the perimeter. Therefore, your answer is 12 units.
Answer: perpendicular
Step-by-step explanation:
Lines with opposite and negated slopes are perpendicular, you can use desmos to graph and check