Snow and ice. Lesson 1 Read the question and choose the correct answer.



Must she wash the dishes?



What can you do at home?

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Объяснение:

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1. yes, the dishes must be washed. because parents should be helped

2. yes

касательные к окружности равны, тоесть ав=вс

треугольники аво и вос равны, ао=ос=10, ов-общая, ав=вс, следовательно во это биссектриса и угол аоб=30 градусов, вс=1/2ов(катет лежащий против угла в 30 градусов)

пусть x - вс, тогда ов=2x

по теореме пифагора

4x^2=x^2+100

x= делить на 3

следовательно во= делить на 3