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This is NEGATIVE. Think of negative as you falling down a mountain, like in that kind of shape, and positive you going up a mountain, undefined as just a line that has no "tilt" and only goes straight up or down, and zero slopes are just horizontal lines. hope this helps.

pls mark as brainliest

Step-by-step explanation:

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

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