Предмет: Алгебра, автор: ytkaaaaa

1.Дана Равнобедренная трапеция ABCD

BC(это есть меньшее основание)=2

AD(большее)=8

<A = 45 градусов

Найдите Площадь этой трапеции.

2. Дана окружность

<AOB=110

Найдите <ACB

Приложения:

Ответы

Автор ответа: pturusov

Первое задание:
Так как угол а равен 45 градусам тогда, если опустить высоту к стороне АD из угла В тогда треугольник ABL-равнобедренный(тк углы при основании равны) соответственно если опустить высоту из угла С то тоже получим равнобедренный треугольник. Тогда АВL = ABK. LK=2. Тогда сторона ВК и сторона ВL будут равны (8-2)/2=3. Высота ВL=3. Sabcd=((8+2)/2)•3=15
Ответ: площадь трапеции равна 15.
Насчет второй задачи то если О-середина окр. тогда угол АСВ равен половине угла АОВ то есть =55 градусам

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