Help fast what does this make as a shape??
Help fast due soon

Can any one me with the answers to these questions asap?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.