Anja is creating a triangle using three straws. the two shorter straws have lengths of 20 cm and 21 cm. how long, in centimeters, should the third straw be for anja to create a right triangle?

Length of third straw must be:

29 cm

Step-by-step explanation:

We know that the longest side in a right angled triangle is its hypotenuse.

Pythagoras theorem says that:

hypotenuse²=base²+perpendicular²

Here, we are given base and perpendicular and we have to find the length of the hypotenuse.

hypotenuse²=20²+21²

                   =400+441

                  =841

hypotenuse=√(841)

                  = 29 cm

Hence, length of the third straw must be:

29 cm

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.