ABCD is a square with one vertex at the center of the circle and two vertices on the circle.what is the length of AC if the area of the circle is 1386 square cm?
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Answer:
Step-by-step explanation:
Area of a circle of radius r =πr 2
=1386cm
27
22×r 2
=1386cm
2r 2
=441cm
2r=21cm
Circumference of a circle of radius r =2πr
Circumference of circle of radius 21cm=2× 7
22×21=132cm
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