giải hộ mik với mik cần gấp lắm ai giải hộ cho 5 sao

Đáp án+Giải thích các bước giải:

Trả lời【Answer】: (c) 6

【Explanation】:
1. Let's denote the radius of circle A as \( r \) and the radius of circle B as \( 3r \) since circle A's radius is 1/3 of circle B's.
2. The circumference of circle A is \( 2\pi r \) and the circumference of circle B is \( 2\pi(3r) = 6\pi r \).
3. When circle A rolls around circle B, it will cover a distance equal to the circumference of circle B, which is \( 6\pi r \).
4. To determine how many times circle A will revolve, we divide the distance it rolls (which is the circumference of circle B) by its own circumference.
5. Therefore, the number of revolutions is \( \frac{6\pi r}{2\pi r} = 6 \).
6. Thus, circle A will revolve 6 times in total when it rolls around circle B once.

$#QN$

$#HD247$