Direct common tangent of two separate circles, square of length = d squared - (r1 - r2) squared: find length, distance or a radius

1. A.
   $2\sqrt{132}$
2. B.
   $\sqrt{153}$
3. C.
   $2\sqrt{153}$
4. D.
   $\sqrt{132}$

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1. A.
   6 cm
2. B.
   3 cm
3. C.
   9 cm
4. D.
   5/2 cm

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1. A.
   $2\sqrt{252}$ cm
2. B.
   $2\sqrt{152}$ cm
3. C.
   $3\sqrt{242}$ cm
4. D.
   $3\sqrt{252}$ cm

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1. A.
   $39$ cm
2. B.
   $29$ cm
3. C.
   $35$ cm
4. D.
   $25$ cm

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1. A.
   $5\sqrt{17}$ cm
2. B.
   $3\sqrt{19}$ cm
3. C.
   $6\sqrt{8}$ cm
4. D.
   $4\sqrt{15}$ cm

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1. A.
   14.586
2. B.
   18.654
3. C.
   16.584
4. D.
   15.486

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1. A.
   15 cm
2. B.
   17 cm
3. C.
   18 cm
4. D.
   20 cm

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1. A.
   $3 \text{ cm}$
2. B.
   $4 \text{ cm}$
3. C.
   $5 \text{ cm}$
4. D.
   $6 \text{ cm}$

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1. A.
   $d = r_1 - r_2$
2. B.
   $d = (r_1 - r_2)^2$
3. C.
   $r_1 = r_2$
4. D.
   $r_1 = 2r_2$

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1. A.
   10 cm
2. B.
   12 cm
3. C.
   $10\sqrt{2}$ cm
4. D.
   $12\sqrt{2}$ cm

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