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Find the area of a triangle whose side...

Find the area of a triangle whose sides are 3cm, 4cm and 5cm respectively.

Text Solution

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`s=(a+b+c)/2`
`=(3+4+5)/2`
`=12/2=6`
Area`=sqrt(s(s-a)(s-b)(s-c))`
`=sqrt(6(6-3)(6-4)(6-5))`
`=sqrt(6xx3xx2xx1)`
`sqrt(36)=6cm^2`
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Knowledge Check

  • The area of a triangle whose sides are 9 cm, 12 cm and 15 cm is

    A
    `54 cm^(2)`
    B
    `60 cm^(2)`
    C
    `64 cm^(2)`
    D
    None of these

  • Find the area of a triangle whose sides are 12 cm, 16 cm and 20 cm.

    A
    `102 cm^(2)`
    B
    `100 cm^(2)`
    C
    `98 cm^(2)`
    D
    `96 cm^(2)`

  • The area of a triangle whose sides are 9 cm , 12 cm and 15 cm is

    A
    ` 54 cm^(2)`
    B
    ` 60 cm ^(2)`
    C
    ` 64 cm^(2)`
    D
    None of these

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