Given that the circle has a diameter of 20cm, calculate:
The circumference of the circle. leave answer in terms of π
calculate the area of the circle. leave answer in terms of π

The answer to your question is Circumference = 20π cm; Area = 100π cm

Step-by-step explanation:

Data

diameter = 20 cm

Circumference = ?

Area = ?

Process

1.- Write the formula of Circumference

Circumference = πd

-Substitution

Circumference = 20π

2.- Write the formula of area of a circle

Area of a circle = πr²

-Calculate the radius

radius = diameter/2

radius = 20/2

           = 10 cm

-Substitution

Area = (10)²π

-Result

Area = 100π

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,