Respuesta :

twvogels
[tex]A=A_{big}-A_{small}[/tex]
[tex]A=\pi R^2-\pi r^2[/tex]
[tex]A=\pi(R^2-r^2)[/tex]
[tex]A=\pi(6.5^2-2.3^2)[/tex]
[tex]A=\pi(42.25-5.29)[/tex]
[tex]A=\pi(36.96)\approx116cm^2[/tex]

Answer: Only give 3/4 marks

A = π × r²

Area of the whole circle.

Area of a circle = pi*r^2

r = 6.5 cm  Note: this is 2 sig digs.

pi= 3.14

Area = 3.14 * 6.5^2

Area = 3.14 * 42.25

Area= 132.665

Area of unshaded smaller circle

pi = 3.14

r = 2.3

Area  = 3.14 * 2.3^2

Area = 3.14 * 5.29

Area = 16.61Area of the whole circle.

Area of a circle = pi*r^2

r = 6.5 cm  Note: this is 2 sig digs.

pi= 3.14

Area = 3.14 * 6.5^2

Area = 3.14 * 42.25

Area= 132.665

Area of unshaded smaller circle

pi = 3.14

r = 2.3

Area  = 3.14 * 2.3^2

Area = 3.14 * 5.29

Area = 16.61

A = 116.113 cm²

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