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 #1
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+2

[ABC] = 180 square units

 

[DEF] = 1/4 [ABC]  = 45 square units

 

[DEF] : [ABC] = 1 : 4

 

∠ABC = tan-1(AC / AB)

 

BC = sqrt(AB2 + AC2) = √801

 

ΔABC inradius  r = 5.349

 

ΔABC circumradius   R = 14.151

 

laugh

 Jan 27, 2021

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