A straight line is drawn through the vertex C of the trapezoid ABCD, which is parallel to the side of AB and and intersects the larger base AD at point E, find the corners of the trapezoid if the angle D = 35, DCE = 65.
By the property of a trapezoid, the sum of the angles at the sides of the trapezoid is 180.
Angle ADC + BCD = 180.
ВСD = 180 – АDC = 180 – 65 = 115.
Then the angle BCE = BСD – DCE = 115 – 35 = 80.
The ABCE quadrilateral is a parallelogram since its opposite sides are parallel. In a parallelogram, opposite angles are equal, then the angle BAE = BAD = BCE = 80.
Then the angle ABC = 180 – BAD = 180 – 80 = 100.
Answer: The angles of the trapezoid are 80, 100, 115, 65.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.