# Write down the equation of a circle with a center O (-2.1) and a radius of 4cm

October 5, 2021 | education

| The circle equation has a canonical form:

(x – x0) ² + (y – y0) ² = R²;

Values used:

x0 – abscissa of the center of the circle;

y0 is the ordinate of the center of the circle;

R is the size of the radius of the circle.

By condition, the center of the circle is at the point O (-2; 1), or x0 = -2, y0 = 1. The radius of this circle is R = 4 cm.

Substituting all these data into the formula, we get the equation:

(x – (-2)) ² + (y – 1) ² = 4²;

(x + 2) ² + (y – 1) ² = 16.

The resulting equality is the desired equation of the circle.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.