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Tai Dinh
2 năm trước

Bài 2.3 hình sbt lớp 9 t1

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chiukiuxiu
2 năm trước

Đáp án:

Bài 2:

Gọi R là bán kính của đường tròn (O; 2). Ta có: R = 2

OA2 = 12 + 12 = 2 ⇒ OA = √2 < 2

Vì OA < R nên điểm A nằm trong đường tròn (O; 2)

OB2 = (√2 )2 + (√2 )2 = 2 + 2 = 4 ⇒ OB = 2

Vì OB = R nên điểm B thuộc đường tròn (O; 2)

OC2 = 12 + 22 = 1 + 4 = 5 ⇒ OC = √5 > 2

Bài 3:

1 - 6

2 - 5

3 - 4

thích các bước giải:

 

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