help geometry

First  one

x  =  180 - 64  - 58  = 58°

Acute ..Isosceles  

Second one :

We have an equilateral triangle  ...each  interior angle  = 60°   = x

Acute...Equiangular....Equilateral....Isosceles  [ some people will debate the "Isosceles" classification...."Isosceles"  is often defined as a triangle having EXACTLY two sides of equal length ]

Last one

x =  [180 - 48 ] / 2 = 132 / 2 =   66°

Acute...Isosceles