How do you do this ?

Area of the shaded region = 75.36 in^2

Step-by-step explanation:

You find the area of the large circle and divide it in half.  You find the area of the small circle and divide it in half. Finally, you subtract the small half circle from the large half circle.

A = area

π = Pi = 3.14

r = radius= the distance from the center of the circle to the edge.

A = π * r * r                                                A = π * r * r

A = 3.14 * 8 * 8                                          A = 3.14 * 4 * 4

A = 200.96                                               A = 50.24

           2                                                              2

A = 100.44 in^2                                        A = 25.12 in^2

100.44 - 25.12 = 75.36 in^2

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

b, i believe, but not sure.