The manhattan project was a u. s government that worked on A. hiring spies for the war
B. creating colonies in japan
C. improving aircraft technology
D. devoloping the atomic bomb​

D. Developing the atomic bomb.

The Manhattan project was specifically made in progress toward the creation of the atom bomb. It is what would cause the nuclear annihilation of Hiroshima and Nagasaki.

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Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160