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1.
In a 
, if 
, then the area of the circumcircle of 
in square unit is
, if , then the area of the circumcircle of in square unit is
2.
The base of a cliff is circular. From the extremities of a diameter of the base of angle of elevation of the top of the cliff are 
and 
. If the height of the cliff be 500 m, then the diameter of the base of the cliff is
and . If the height of the cliff be 500 m, then the diameter of the base of the cliff is
3.
If 
denotes circumradius, then in 
is equal to
denotes circumradius, then in is equal to