To find the area of a circle, one must know what the formula is, and what all parts of the formula mean.
The formula for the area of a circle is: πr²
Now we have to understand what each part of the formula means. The pi symbol (π) is the ratio of a circle's circumference to its diameter, and is approximately 3.14. The r, is the radius of a circle, and since the squared sign is above it, that means that it is the radius multiplied by itself.
Gorbachev pursued glasnost and perestroika reforms because the Soviet economy could not keep up with the arms race. The correct option among all the options that are given in the question is the first option. The war of Afghanistan was proving a bit heavy on the Soviet economy. To stabilize the economy, Gorbachev pursued such policies.
D. judgement is the ability to tell right from wrong
