An anthropology graduate student measures the floor of a round hut and calculates that it has an area of 12.56 square meters. What is the floors diameter ?

The diameter of the room is 4 m.

Step-by-step explanation:

Since the hut is round we can assume that the floor is a circle, so in order to find the diameter of the floor we need to use the circle's area which is given by:

circle area = π*r²

In this case we have the area of the floor, so we can solve for "r". We have:

12.56 = π*r²

π*r² = 12.56

r² = 12.56/π

r² = 12.56/3.14 = 4

r = sqrt(4) = 2 m

The diameter is 2*r so the diameter of this room is 4 m.

ab will be equal to

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: