Given: angles ABC is a right angle and angles DEF is a right angle. Prove: All right angles are congruent by showing that angles ABC congruent angles DEF.

What are the missing reasons in the steps of the proof?

A: Def. of right angle, def. of congruent, def. of equal, def. of 90°

B: Identity prop., reflexive prop., subtitution prop., symmetric prop.

C: Def. of congruent angles, def. of equal angles, substitution prop., symmetric prop.

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.

can i see the following ?

step-by-step explanation:

total of apples - take away four

6-4 = 2

answer is 2 apples

the answer is 64 cm

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