Answer:
Square
Step-by-step explanation:
Adjacent sides of a square and a rectangle are always perpendicular to each other. Sides of the right-angled triangle enclosing the right angle are perpendicular to each other.
The square is made of four lines. Because each line is perpendicular to two other lines, a square has four right angles. ... Like a square, a rectangle has lines that are perpendicular to two other lines. This means it also has four right angles.
