The meaning of the area is the measurement of a surface in this case a circle, which can be find by using the formula A=<span>πr^2, where r is equal to the radius of the circle.
On this exercise is given that a circle has a diameter of 10cm and it is asked to find its area, as previous said the only way to find the area of a circle is to use the formula A=</span><span>πr^2, but on this case the radius is not given. As result you have to divide the measurement of the diameter by two, and the number found represents the radius.
10cm/2= 5cm The radius of the circle is 5cm.
Now that the radius is known you can substitute the values in the formula to find the area of the circle.
There are 256 possible combinations of fireworks, if they can be repeated in each 4 firework combinations. If they cannot be repeated, there are 24 possible combinations.
