Answer:
Isosceles right
Step-by-step explanation:
It's a right triangle because one of the angles is 90 degrees
It's isosceles because two sides are 5.57
The answer is B. Rational
2:3:4
Shortest is clearly 2
(2×7.5):(3×7.5):(4×7.5)
So the sides are 15 , 22.5 and 30
Perimeter = 15 + 22.5 + 30
Perimeter = 67.5