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Question

Answer 1

Answer:

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.