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Question

In an equlilateral triangle, (circumradius) : (inradius) : (exradius) is equal to


A

1 : 1 : 1

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B

1 : 2 : 3

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C

2 : 1 : 3

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D

3 : 2 : 4

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Solution

The correct option is C

2 : 1 : 3


The exradius =4RsinA2.cosB2.cosC2=4R.12.32.32=32RAlso r=4RsinA2sinB2sinC2r=R2R:r:extradius=R:R2:2R21:12:32 or 2:1:3


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