# Write an equation in standard form for the given circle

In this example, the coefficients are 4 and Also, remember that the formula says "r2", not "r", so the radius in this case is sqrt 5not 5. Read off the answer. The square of 2 is 4 and the square of -3 is 9. Take the x-term coefficient, multiply it by one-half, square it, and then add this to both sides of the equation, as shown.

Read off the answer from the rearranged equation. You'll need space inside your groupings, because this is where you'll add the squaring term. A circle's equation can have either a general or standard form. Gartneer Different geometric shapes have their own distinct equations that aid in their graphing and solution.

## How to write the standard equation of a circle

Also, if you get in the habit of always working the exercises in the same manner, you are more likely to remember the procedure on tests. General Equation Subtract the constant term from both sides from both sides of the equation. Substitute h with the center's x-coordinate, k with its y-coordinate, and r with the circle's radius. Rewrite the expressions inside the parentheses as a single-degreed variable added to the respective coefficient half from Step 3, and add an exponential 2 behind each parentheses set to convert the equation to the standard form. The square of 2 is 4 and the square of -3 is 9. Here is the equation they've given you. Warning: If you drop a negative, you'll get the wrong answer for the coordinates of the center, so be careful of this. Halve the coefficients, then square the halves.

In the course of the above procedure, about the only other thing that can be a problem is forgetting the sign on the step where you multiply by one-half. Be careful with the signs; don't just "read off the answer" without thinking.

## Geometry equations of circles

Do the same with the y-term coefficient. Gartneer began writing professionally in working in conjunction with FEMA. Whatever is multiplied on the squared terms it'll always be the same number , divide it off from every term. Photo Credits. When not working on his children's book masterpiece, he writes educational pieces focusing on early mathematics and ESL topics. Convert the left-hand side to squared form, and simplify the right-hand side. The square of 2 is 4 and the square of -3 is 9. General Equation Subtract the constant term from both sides from both sides of the equation. Advertisement Warning: Don't misinterpret the final equation. This is the complicated step.

Always do the steps in this order, and each of your exercises should work out fine.

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