Skill 9 Circle Equations (RED2)

What is the correct formula for the equation of a circle?

• y = mx +b

• • y = ax² + bx + c

• • (x - h)² + (y - k)² = r²

• • (x + h)² - (y + k)² = r²

What is the Pythagorean Theorem?

• • leg + leg = hypotenuse 

• • leg² + leg² = hypotenuse²

If the center is at (-5, 2), which equation below MIGHT be the correct equation?

• • (x - 5)² + (y - 2)² = r²

• • (x + 5)² + (y - 2)² = r²

• • (x + 5)² - (y + 2)² = r²

  
  

What is the formula for the area of a circle?

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What is the formula for the circumference of a circle?

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If the center is at (0, 3), what MIGHT be the correct formula for this circle?

• • (x - 0)² + (y - 3)² = r²

• • (x + 0)² + (y + 3)² = r²​

• • (x - 3)² + (y - 0)² = r²​