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8th Class Mathematics Sample Paper Mathematics Sample Paper - 7

  • question_answer
    The sides of a triangle are \[3x+1,\text{ }-\text{ }x+2\]and 4x + 6, then find its perimeter.

    Answer:

    Let        \[AB\text{ }=\text{ }3x\text{ }+\text{ }1\]
    \[BC=-x+2\]
    \[AC\text{ }=\text{ }4x\text{ }+\text{ }6\]
    Since, perimeter of \[\Delta ABC\text{ }=\text{ }AB\text{ }+\text{ }BC\text{ }+\text{ }AC\]
    \[=3x+1+\left( -x+2 \right)+4x+6\]
    \[=3x+1-x+2+4x+6\]
    \[=6x+9\]


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