Arthur D. answered • 09/05/17

Effective Mathematics Tutor

diameter=√[(8-2)^2+(9-1)^2]

diameter=√(6^2+8^2)=√(36+64)=√100=10

radius=(1/2)*diameter

radius=(1/2)*10=5

A=∏r^2

A=∏*5^2

A=25∏

Liam V.

asked • 09/05/17there is nothing else you need to know about this problem

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Arthur D. answered • 09/05/17

Effective Mathematics Tutor

diameter=√[(8-2)^2+(9-1)^2]

diameter=√(6^2+8^2)=√(36+64)=√100=10

radius=(1/2)*diameter

radius=(1/2)*10=5

A=∏r^2

A=∏*5^2

A=25∏

Alexander B. answered • 09/05/17

PhD in Engineering with 10 Years of jQuery programming experience

First, let's calculate the Diameter: D = √((8-2)^{2}+(9-1)^{2}) = √(36+64)=10

The area: A = πD^{2}/4 = **25π** (the answer)

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