Mathematics

Problem

Quadrilateral

ABCD

has

AB \parallel CD

and

AB = CD = 8\,\text{cm}

. If

BC = 7\,\text{cm}

and diagonal

AC = 10\,\text{cm}

, find

AD

. a)

10\,\text{cm}

7\,\text{cm}

12\,\text{cm}

8\,\text{cm}