Answer:
34 cm
Step-by-step explanation:
Use the perimeter formula for the rectangle: 2a + 2b
2(11) + 2(3)
22 + 6
28
Use the perimeter formula for the triangle: a + b + c
Since the triangle is equalateral, that means all sides are same
3 + 3 + 3
9
Add them both together but subtract that 6 that is not included
28 + 9 - 6
31
Answer: 34 cm
