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Godsgirl

  • 4 years ago

What is the length of side BC? A: 6 B: 21 C: 9 D: 15

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  1. Godsgirl
    • 4 years ago
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    |dw:1326996522947:dw|

  2. cc104567
    • 4 years ago
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    \[a^{2}+b ^{2}=c ^{2}\] \[15^{2}+\left( x+6 \right)^{2}=x ^{2}\] use foil

  3. lcf1999
    • 4 years ago
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    those lines there mean that the two sides are congruent and x would be 15 and 15 plus 6 is 21 so the answer is 21.

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