Transverse common tangent, square of length = d squared - (r1 + r2) squared (alone or with the direct one)

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

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1. A.
   6 cm
2. B.
   7.5 cm
3. C.
   9 cm
4. D.
   8 cm

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1. A.
   12
2. B.
   14
3. C.
   10
4. D.
   8

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1. A.
   $6\sqrt{7}(\sqrt{7} + 2)$
2. B.
   $6\sqrt{5}(\sqrt{5} + 2)$
3. C.
   $6\sqrt{7}(\sqrt{5} + 2)$
4. D.
   $6\sqrt{5}(\sqrt{7} + 2)$

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1. A.
   10
2. B.
   $10\sqrt{2}$
3. C.
   $5\sqrt{2}$
4. D.
   20

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1. A.
   4 cm
2. B.
   1 cm
3. C.
   6 cm
4. D.
   7 cm

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1. A.
   6 cm
2. B.
   8 cm
3. C.
   10 cm
4. D.
   12 cm

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