What is the radius of a circle whose equation is x2 + y2 + 8x – 6y + 21 = 0? units

The radius of the given circle is 2 units.

Step-by-step explanation: We are given to find the radius of a circle with the following equation:

The STANDARD FORM of a circle with centre at the point (h, k) and radius 'r' units is given by

From equation (i), we have

Comparing this standard equation of the circle with the general standard equation (ii), we get

centre, (h, k) = (-4, 3) and radius, r = 2 units.

Thus, the radius of the given circle is 2 units.

they are both synthetic elements

explanation:

d

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.