Question

помогите! геометрия седьмой класс.

Answer 1

3. 3x + x = 136
4x = 136
x = 34.
ABD = 34
CBD = 102

4. 14 + 14 + 2x = 88
28 + 2x = 88
2x = 88-28
2x = 60
x = 60:2
x = 30
AOB = 30.