Research work:
can we say that the circumference of a circle is in direct or inverse variation with its radius? verify with examples
also find out the relation between area and radius of the circle.

Step-by-step explanation:

The circumference of a circle is equivalent to its outer boundary. The circumference of a circle is given by :

.............(1)

r is the radius of circle

It is clear from equation (1) that the circumference of circle is directly proportional to its radius. For example, if the radius of circle is 2 cm, its circumference would be .

On increasing the radius i.e. 4 cm, circumference becomes .

The relationship between the area and the radius of circle is given by :

r is the radius of circle

Hence, this is the required solution.

typically if you want , you would actually put questions here for us to you. but hey, that's just me. maybe someone will magically answer the questions for you without knowing what they are.

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign