What is the radius of the circle: x^2+y^2=4 1. (0, -4) 2. (0, 4) 3. (2, -4) 4. (0, 0)

Question

What is the radius of the circle: x^2+y^2=4

1. (0, -4)
2. (0, 4)
3. (2, -4)
4. (0, 0)

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Kim Cúc 3 years 2021-07-25T22:16:26+00:00 1 Answers 8 views 0

Answers ( )

  1. thienthanh
    0
    2021-07-25T22:17:39+00:00
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    Answer:

    radius = 2

    Step-by-step explanation:

    The equation of a circle centred at the origin is

    x² + y² = r² ( where r is the radius )

    x² + y² = 4 ← is in this form

    with r² = 4 ⇒ r = \sqrt{4} = 2

    centre (0, 0 ) and radius = 2

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )