Circles touching externally: direct common tangent = 2 x square root of r1 r2

1. A.
   $10\sqrt{2}$ cm
2. B.
   $8\sqrt{2}$ cm
3. C.
   $9\sqrt{2}$ cm
4. D.
   $6\sqrt{2}$ cm

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1. A.
   $4\sqrt{22}$ cm
2. B.
   $8\sqrt{11}$ cm
3. C.
   $4\sqrt{11}$ cm
4. D.
   $8\sqrt{22}$ cm

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1. A.
   21 cm
2. B.
   18 cm
3. C.
   20 cm
4. D.
   22 cm

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

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

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1. A.
   $12\sqrt{6}$
2. B.
   $18\sqrt{6}$
3. C.
   $15\sqrt{6}$
4. D.
   $10\sqrt{6}$

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1. A.
   $8\sqrt{2}$
2. B.
   $16\sqrt{2}$
3. C.
   $8\sqrt{3}$
4. D.
   $16\sqrt{3}$

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1. A.
   $T = r_1 + r_2$
2. B.
   $T = 2(r_1 + r_2)$
3. C.
   $T = 2\sqrt{r_1 r_2}$
4. D.
   $T = r_1^2 + r_2^2$

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

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