Legs = 20 mm and 27 mm
a? + b2 = c2
2 points
YOUR QUESTION:
6
20 mm
27 mm

a=18.1 or √329

Step-by-step explanation:

a²+b²=c²

a²+20²=27²

a²+400=729

a²=329

a=18.1 or √329 depending on what form you are answering in, radical or decimal.

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

what is the rest of the question? ?