Предмет: Алгебра, автор: Аноним

Алгебра. Даю 15 балів.

Потрібно вирішити 3 завдання, з максимальним поясненням і малюнками!

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Ответы

Автор ответа: ludmilaksenija2005

1

Объяснение:

1. на фото

ответ:768 см²

2.

n=∠KAD=90°

Sсек=S(KAD)=100π cм²

Sсек=πR²/360•n=πR²/360•90=πR²/4

4Sceк=πR²

R²=4•100π/π=400

R=√400=20 см

АD=R=20 см

у=МС=АD-BM=20-16=4 см

ответ: 4 см

3.

∆BOC~∆АОD по 2 углам

ВО/АО=CO/DO

BO/8=20/5

BO=8•20:5=32 см

АВ=ВО+АО=32+8=40 см

ответ: Г

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