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Theorem: The length of two tangents draw...

Theorem: The length of two tangents drawn from an external point to a circle are equal.

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In `Delta PAD` and `Delta QAD`,
seg `PA ~=`seg QA …(Radii of the same circle )
seg `AD ~=` seg AD …...(Common side )
`/_ APD = /_AQD = 90^(@)` …(Tangent theorem )
`:. Delta PAD ~=Delta QAD ` ....(Hypotenuse side theorem )
`:.` seg `DP ~=` seg DQ ....(c.s.c.t. )
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