Finding the Centre & Radius (Edexcel A-Level Mathematics): Flashcards

📚Flashcards
Revision NotesModel AnswersQuizzesFlashcardsExam Questions
Finding the Centre & Radius
Sign up to keep revising.Create a free account to study more flashcards and track your progress.

Practise the cards

10 cards from this deck

Show

What is the standard form of a circle's equation?

(x−h)2+(y−k)2=r2(x - h)^2 + (y - k)^2 = r^2

How do you find the center of a circle in standard form?

Center is (h,k)(h, k) from the standard form.

What does rr represent in the circle equation?

rr represents the radius of the circle.

Find the center of (x−3)2+(y+2)2=16(x - 3)^2 + (y + 2)^2 = 16.

Center is (3,−2)(3, -2).

Calculate the radius for (x−3)2+(y+2)2=16(x - 3)^2 + (y + 2)^2 = 16.

Radius is 44.

What is the general form of a circle's equation?

x2+y2+Dx+Ey+F=0x^2 + y^2 + Dx + Ey + F = 0

What is the first step in using the general form?

Group the xx-terms and yy-terms.

How do you complete the square for x2+4xx^2 + 4x?

Add and subtract 44.

State the center from (x+2)2+(y−3)2=25(x + 2)^2 + (y - 3)^2 = 25.

Center is (−2,3)(-2, 3).

What is the radius of (x+2)2+(y−3)2=25(x + 2)^2 + (y - 3)^2 = 25?

Radius is 55.

Explore Edexcel A-Level Mathematics Revision Notes by Topics

Equation of a Straight Line

Circles

Explore Edexcel A-Level Mathematics Model Answers by Topics

Equation of a Straight Line

Circles

Explore Edexcel A-Level Mathematics Quizzes by Topics

Equation of a Straight Line

Circles

Explore Edexcel A-Level Mathematics Exam Questions by Topics

Equation of a Straight Line

Circles

Join 100,000+ A-Level students studying Flashcards with us.

Select your subjects, and get access to A+ resources today.