Just plug in 3 into the formula that you have been given and solve the equation.
It's gonna be an irrational number because the length of the hypotenuse is 6.40312....... cm


An irrational number cannot be written as a simple fraction and the decimals would keep on going without a pattern (if it was repeating, it would be rational).
Answer:
Sum of interior angles of polygon = (n-2)*180
1) Pentagon:
2)Hexagon:
3) Heptagon:
4) Octagon:
The answer is (3x + 5) ^2