Question

Find the area btw 2 concentric circles of radius 4 cm and 3 cm

Answer 1

Hey there,

Area between circles
=Area of bigger circle-Area of smaller circle
=π4cm²-π3cm²
=16π-9π
=π(16cm-9cm)
=7π
=7*22/7
=22 cm²

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Answer 2

area= π(R^2-r^2)
=22/7(16-9)
=22cm^2