A rectangle is a quadrilateral, which means it has four sides.

Here are the solutions to the mathematics questions:

1. A rectangle is a quadrilateral, which means it has four sides.

   • The correct option is (b) 4.

2. By definition, a square is a special type of rectangle where all four sides are of equal length.

   • The correct option is (c) equal.

3. This question asks for an item that is NOT an example of a square (or a cube, which has square faces).

   • (a) Matches box: Typically a rectangular prism (cuboid), whose faces are rectangles, not necessarily squares.
   • (b) Maggi (cube): Refers to a bouillon cube, which is a cube and has square faces.
   • (c) Cube: A 3D shape with six square faces.
   • (d) Choco milo: A beverage, not a geometric shape.
   • Among the given options, a matches box is usually not a cube.
   • The correct option is (a) Matches box.

4. A triangle is a polygon defined by three straight sides and three angles.

   • The correct option is (c) 3.

5. This question asks to identify which option is not a type of triangle.

   • (a) Equilateral, (b) Scalene, and (c) Obtuse are all classifications of triangles based on their sides or angles.
   • (d) Pyramid is a three-dimensional geometric solid, not a type of triangle.
   • The correct option is (d) Pyramid.

6. An equilateral triangle is defined as a triangle where all three sides are of equal length.

   • The correct option is (a) equal sides.

7. A right-angle triangle (or right triangle) is a triangle that contains exactly one angle measuring 90 degrees.

   • The correct option is (c) 1.