Question

В трапеции ABCD угол B=128 угол С=115.Чему равна сумма градусных мер углов A и D?Пожалуйста помогите.

Answer 1

Сумма всех углов 360 градусов
360-128-115=117

Answer 2

Problem Analysis

We are given a trapezoid ABCD, where angle B is 128 degrees and angle C is 115 degrees. We need to find the sum of the degree measures of angles A and D.

Solution

To find the sum of the degree measures of angles A and D, we need to use the fact that the sum of the degree measures of the angles in any quadrilateral is always 360 degrees.

In trapezoid ABCD, we can see that angles B and C are given, but angles A and D are not specified. However, we know that the sum of the degree measures of angles A, B, C, and D in trapezoid ABCD is 360 degrees.

Therefore, we can set up the following equation:

A + B + C + D = 360 degrees

Substituting the given values:

A + 128 + 115 + D = 360 degrees

Now, we can solve for the sum of angles A and D:

A + D = 360 - (128 + 115) degrees

Simplifying:

A + D = 360 - 243 degrees

A + D = 117 degrees

Therefore, the sum of the degree measures of angles A and D in trapezoid ABCD is 117 degrees.

Answer

The sum of the degree measures of angles A and D in trapezoid ABCD is 117 degrees.