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If the area os a triangle is 81 square c...

If the area os a triangle is 81 square cm and its perimeter is 27 cm, then find its in-radius in centi-metres.

A

6

B

3

C

1.5

D

none

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • If area of a triangle is 81 cm^(2) and its semiperimeter is 27 cm then area of incircle of the triangle is

    A
    `6pi" "cm^(2)`
    B
    `3pi" "cm^(2)`
    C
    `18pi" "cm^(2)`
    D
    `9pi" "cm^(2)`

  • the area of an equilateral triangle is 4 sqrt(3) cm^(2) Its perimeter is

    A
    `9 cm`
    B
    12 cm
    C
    `12 sqrt(3)` cm
    D
    `6sqrt(3) cm`

  • The area of a square is 72.25 cm^2 . Find its perimeter (in cm).

    A
    68
    B
    44
    C
    34
    D
    85

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    The area of a right angled triangle is 6 sq . Cm and its perimeter is 12 cm . The length of its hypotenuse is

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