In an isosceles trapezoid, the diagonals are perpendicular. Height 15 cm. Find the midline.

1. A, B, C, D – tops of an isosceles trapezoid. RK middle line.

2. From the top B we lower the perpendicular BH to the base of AD.

3. Since, according to the problem statement, the diagonals of this trapezoid are perpendicular, then, according to its properties, the length of the middle line is equal to the height of this geometric figure:

BH = PK = 15 centimeters.

Answer: the length of the middle line of the RK trapezoid ABCD is 15 centimeters.

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.