Answer :
Answer:
25.5 cm
Step-by-step explanation:
[tex]s = \frac{a + b + c}{2} [/tex]
[tex] = \frac{9 + 12 + 30}{2}cm \\ = \frac{51}{2}cm \\ 25.5cm[/tex]
Answer:
Step-by-step explanation:
[tex] = \frac{9 + 12 + 30}{2}cm \\ = \frac{51}{2}cm \\ 25.5cm[/tex]