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Types of Triangles:
          Equilateral Triangle: All sides and angles are equal (each angle is 60°).
          Isosceles Triangle: Two sides are equal, and the angles opposite these sides are
          equal.
          Scalene Triangle: All sides and angles are different.
      Sum of angles in a triangle: Always 180°.
      Area of Triangle:
                                                 1
                                     Area =        × Base × Height
                                                 2
                                                   
      Pythagoras Theorem (for right-angled triangles):
                                Hypotenuse2 = Base2 + Height2
  4. Quadrilaterals
      Types:
          Rectangle: Opposite sides are equal, and all angles are 90°.
          Square: All sides and angles are equal (90°).
          Parallelogram: Opposite sides are equal and parallel.
          Rhombus: All sides are equal, but angles are not 90°.
          Trapezium: Only one pair of opposite sides is parallel.
      Area of Rectangle:
                                      Area = Length × Width
      Area of Square:
                                               Area = Side2
      Area of Parallelogram:
                                        Area = Base × Height
      Area of Rhombus:
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