Answer: 
Step-by-step explanation:
Equilateral triangle has equal sides, let the side be
, then the perimeter is 
Therefore:



To find the altitude , we will apply Pythagoras theorem , that is

Therefore:



take the square root of both sides

Answer:
11
Step-by-step explanation:
13 + 9 = 22
22/2 = 11
Answer:
70 degrees
Step-by-step explanation:
Step-by-step explanation:
bruh did u have hentoi as your pic