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Maths-

General

Easy

Question

If the area of a triangle is 81 square cm and its perimeter is 27cm then its in-radius in centi-metres is -

6
3
1.5
None of these

The correct answer is: 6

Related Questions to study

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(r1 + r2) (r2 + r3) (r3 + r1) =

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r2 r3 + r3 r1 + r1 r2 =

If the sides be a, b, c then $fraction numerator r subscript 1 end subscript minus r over denominator a end fraction plus fraction numerator r subscript 2 end subscript minus r over denominator b end fraction$ =

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Statement-1 (A) : If $stack a with rightwards arrow on top$ , $stack b with rightwards arrow on top$ , $stack c with rightwards arrow on top$ are unit coplanar vectors then [2 $stack a with rightwards arrow on top$ – $stack b with rightwards arrow on top$ 2 $stack b with rightwards arrow on top$ – $stack c with rightwards arrow on top$ – $stack a with rightwards arrow on top$ ] = 0
Statement-2 (R) : [ $stack a with rightwards arrow on top$ , $stack b with rightwards arrow on top$ , $stack c with rightwards arrow on top$ ] = 0

Statement-1 (A) : If $stack a with rightwards arrow on top$ , $stack b with rightwards arrow on top$ , $stack c with rightwards arrow on top$ are unit coplanar vectors then [2 $stack a with rightwards arrow on top$ – $stack b with rightwards arrow on top$ 2 $stack b with rightwards arrow on top$ – $stack c with rightwards arrow on top$ – $stack a with rightwards arrow on top$ ] = 0
Statement-2 (R) : [ $stack a with rightwards arrow on top$ , $stack b with rightwards arrow on top$ , $stack c with rightwards arrow on top$ ] = 0

Statement-1 (A) : If $stack a with rightwards arrow on top$ , $stack b with rightwards arrow on top$ , $stack c with rightwards arrow on top$ are non coplanar vectors then vectors 2 $stack a with rightwards arrow on top$ – $stack b with rightwards arrow on top$ +3 $stack c with rightwards arrow on top$ , $stack a with rightwards arrow on top$ + $stack b with rightwards arrow on top$ –2 $stack c with rightwards arrow on top$ , $stack a with rightwards arrow on top$ + $stack b with rightwards arrow on top$ – 3 $stack c with rightwards arrow on top$ are also non coplanar.
Statement-2 (R) : Three vector $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ are non coplanar then [ $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ ]  0

Statement-1 (A) : If $stack a with rightwards arrow on top$ , $stack b with rightwards arrow on top$ , $stack c with rightwards arrow on top$ are non coplanar vectors then vectors 2 $stack a with rightwards arrow on top$ – $stack b with rightwards arrow on top$ +3 $stack c with rightwards arrow on top$ , $stack a with rightwards arrow on top$ + $stack b with rightwards arrow on top$ –2 $stack c with rightwards arrow on top$ , $stack a with rightwards arrow on top$ + $stack b with rightwards arrow on top$ – 3 $stack c with rightwards arrow on top$ are also non coplanar.
Statement-2 (R) : Three vector $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ are non coplanar then [ $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ , $Error converting from MathML to accessible text.$ ]  0

parallel

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