Square (regular quadrilateral):

all four sides are of equal length (equilateral), and all four angles are right angles. 

A triangle that has no equal sides and no equal angles is known as a Scalene Triangle

while 

if two sides of a triangle are of equal length, then it is called. Isosceles triangle

1. 5
2. 6
3. 7
4. 8

1. 70
2. 69
3. 68
4. None of these

1. (-2A)^B
2. -2A²B
3. Both are equal
4. Cannot be determined

1. 78
2. 79
3. 80
4. None of these

1. 0.2
2. 0.4
3. 0.5
4. None of these