At the end of the lesson, you will turn in the following: . a key describing each element • a reflection about difficulties you encountered during this portfolio • a wrapping paper design with the elements numbered • instructions for creating each element, written in your own words at least four constructions with extraneous marks

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

13cm

step-by-step explanation:

(apex)

127

whether it's diameter, or radius, i believe if i remember correctly from school, every amount has to always add up to 180. so if you take 53, and starting adding, long story short, taking 127 and adding it to 53, gives you 180.