Question

this solution please​

Answer 1

Answer:

x ∈ (9,∞)

Step-by-step explanation:

In this question, if the angle between side 'x' and the side which measures 3cm is 90 degrees, then :

According to the Pythagoras Theorem,

a²+b² = c² [Where 'c' is the hypotenuse.]

x²+3² = 12²

x² = 144 - 9

x = √135

Else,

If the angle is not given, then :

The sum of the first two sides should be greater than the third side for the triangle to be valid.

x+3>12

x>12-3

x>9

∴x ∈ (9,∞)