Examples -> Geometry -> Two-dimensional geometric shapes -> Quadrilaterals

 Exercise 1. [ID:343] Calculate the area of the parallelogram if its altitudes are 3 and $2\sqrt{3}$ cm, and the angle $between tham is$ 60°!
 Exercise 2. [ID:345] The paralell sides of the trapezoid orund the circle has length of 8 cm and 2 cm. Calculate the area of the trapezoid!
 Exercise 3. [ID:373] Length of the sides of cyclic trapezoid are: AB = 5 cm, BC = 2,5 cm, CD = 2 cm and DA = 2,5 cm. a) Calculate the angles of the trapezoid!b) Determine the ratio of ABC and ACD triangles!c) The inner angles of the trapezoid are marked with an arc of 5 mm radius. Calculate the sum of the four arc lengths!