How many right angles does a rectangle have?

Hint: In geometry, a closed figure is called a polynomial. The point at which two adjacent lines of a polygon meet are called the vertices and the line joining the vertices is called the side. Polygons are of several types depending on the number of sides the polygon has. A rectangle is a polygon having four sides. Using the properties of a rectangle, we can find out the number of right angles it has.

Complete step-by-step answer:
A rectangle has four sides, opposite sides of a rectangle are always equal in length. All the sides of the rectangle are perpendicular to each other, that is the angle between any two sides of a rectangle is 90 degrees. The sum of all the interior angles present in a rectangle is 360 degrees.
So the number of right angles in a rectangle is equal to 360 degrees divided by 90 degrees, that is, 4.
Hence, a rectangle has 4 right angles.
So, the correct answer is “4”.

Note: A quadrilateral is a polygon that has four sides. The diagonal of a quadrilateral divides it into two triangles, as we know the sum of all interior angles of a triangle is 180 degrees, the sum of all the interior angles of a quadrilateral is 360 degrees. As the rectangle also has 4 sides, it is a type of quadrilateral and thus follows the quadrilateral angle sum property that’s why the sum of all the angles in a rectangle is equal to 360 degrees.