A B C D 2x – 15 b cm (7 – b) cm 75 Solution a cm ∵ B = D (opp. 3 = bĤ cm Find the unknowns in the figure. A B C D 2x – 15 b cm (7 – b) cm 75 Solution a cm ∵ěC = AD (opp. SolutionĤ cm Find the unknowns in the figure. s, AB // DC)  = + 180 30 y ∴  = 150 yĨ Follow-up question Find the unknowns in the figure. AO = OC, BO = OD ħ Can you find the unknowns in the figure?ī C D 30 y 7 cm x cm In the figure, ABCD is a parallelogram. Ĭ D Property III O The diagonals of a parallelogram bisect each other. A = C, B = D The opposite angles of a parallelogram are equal. What are the properties of a parallelogram?ĥ The opposite sides of a parallelogram are equal.ī C D Property I AD = BC The opposite sides of a parallelogram are equal. A and C are a pair of opposite angles, sum of interior angles of a quadrilateral = (4 – 2)  180Ī parallelogram is a quadrilateral that has two pairs of parallel opposite sides. In a quadrilateral, (c) any two interior angles that are not lying on the same side are called opposite angles, (d) the sum of all the interior angles is 360.

AD and BC are a pair of opposite side without a common vertex,ģ Quadrilaterals A polygon with four sides is called a quadrilateral.ī C D A polygon with four sides is called a quadrilateral. AB and BC are a pair of adjacent sides with common vertex B, e.g. In a quadrilateral, (a) any two sides that have a common vertex are called adjacent sides, (b) any two non-adjacent sides are called opposite sides, e.g. Presentation on theme: 'Parallelograms.'- Presentation transcript:Ģ Quadrilaterals A polygon with four sides is called a quadrilateral.ī C D A polygon with four sides is called a quadrilateral.

In parallelogram abcd what is dc