题目

$1150 a month - Bright room on 18th Avenue Our roommate is moving and we're looking for someone to fill her spot. Move-in date is April 15. We are looking for someone responsible who can appreciate a friendly relaxed household. Common areas must be cleaned on a regular basis and we all take turns with house cleaning. About us You'll be sharing the house with a young female professional and a couple with healthy lifestyles who works with a game publishing company. We're clean and considerate and respect one another's privacy. The environment is quiet.  Your room It is a clean room th在菱形ABCD中，∠A=120°，如果它的对角线BD为8cm，（1）求对角线AC的长．（2）求该菱形的面积．