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we know that area of triangle =pi ×r²
Step-by-step explanation:
here r=21 cm so area of ABO=22/7×21²=1386 cm²
Area of ABC=area of ABO-ACO
we know that area of triangle =base ×height/2
ACO is a right angled triangle so height of triangle =CO=13 cm
Area of triangle=21×13/2=136.5 cm²
area of ABC=1386-136.5=1249.5cm².
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