Mathegoras

Coordinate geometry › Circles in coordinates › Centre and radius

Area of circle through three points

High school · ●●○○○ 20 pts

A circle passes through the points (1,1)(1,1), (1,7)(1,7), and (9,1)(9,1). The area of the circle can be expressed as kπk\pi. Find the value of kk.

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circlesright trianglesThales theoremPythagorean theorem