Step-by-step explanation:
If no sides of a triangle are congruent (equal) then it is SCALENE
If two sides of a triangle are congruent (equal) then it is ISCOSCELES
If all sides of a triangle are congruent (equal) then it is EQUILATERAL
90, 35, 55: no sides are congruent = SCALENE
700, 550, 550: two sides are congruent = ISCOSCELES
350, 400, 1000: no sides are congruent = SCALENE
460, 460, 440: two sides are congruent = ISCOSCELES
1200, 300, 300: two sides are congruent = ISCOSCELES
