Answer:
Step-by-step explanation:
Below the sea level should be mentioned by negative value
So, It is = - 4.5
78 + 52 + X + 54 = 180
130 + X + 54 = 180
X + 54 = 180 - 130
X = 50 - 54
X = -4
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No
No, 5cm, 5cm, and 15cm cannot create a triangle because the side lengths do not follow the formula a + b > c. Since 5 + 5 = 10, and 10 is not greater than 15, these side lengths won't be able to form a triangle.
Hope this helps!!
