В треугольнике ABC AB=BC. Высота AK делит сторону BC на отрезки BK=24 см и KC=1 см. Найдите площадь треугольника и сторону AC.

Помогите плиз. заранее спасибо. 

помогите пожалуйста поставить нужные предлоги

1. Sandra was ... bed. She waited ... the postman to arrive. While she lay there she was thinking ... the application she had made for the scholarship. Suddenly she got... , put... her dressing gown and went... the bathroom. While she was having a shower she heard the postman. He knocked ... the door and her mother opened it. When Sandra entered ... the breakfast room, a letter was lying ... the table.

2 I'm a member ... a group who spend weekends looking ... footpaths, building walls and planting trees. We are not paid what we do but we enjoy it very much. You don't need any previous experience but it helps if you are fond ... gardening. The most attractive thing about it is that you meet ... other people interested ... nature and preserving the countryside.

3. We were late as usual. My husband had insisted ... doing his packing ... himself, and when he discovered that he couldn't manage he'd asked me ... help ... the last moment. So we had an hour to get... the airport. Luckily, there wasn't much traffic ... the road and we were able to get there just...

time.

шо таке моногібридне схрещування ??