Question

Точка С лежит на отрезке ВD. Известно, что ВD = 12 см, СD = 9 см. Найдите ВС.

Answer 1

Ответ: 3 см

Объяснение:

подсказка - нарисовать отрезок BD, поставить на нем точку С, и подумать немного.

Answer 2

Problem Analysis

We are given that point C lies on line segment BD, and the lengths of BD and CD are given as 12 cm and 9 cm, respectively. We need to find the length of segment BC.

Solution

To find the length of segment BC, we can use the segment addition postulate, which states that if three points A, B, and C are collinear, then the distance between A and C is equal to the sum of the distances between A and B, and B and C.

In this case, we have point B, point C, and point D, which are collinear. So, we can use the segment addition postulate to find the length of segment BC.

The length of segment BD is given as 12 cm, and the length of segment CD is given as 9 cm. Therefore, we can write the equation:

BC = BD - CD

Substituting the given values, we have:

BC = 12 cm - 9 cm

Simplifying the equation, we get:

BC = 3 cm

Therefore, the length of segment BC is 3 cm.

Answer

The length of segment BC is 3 cm.