Need your help please

Question

So i have this quiz today and I’ve got an example for it so this is what the questions that will come
Q/
Write a program to check whether a triangle is valid or not, when the three angles of the triangle are entered by the user. A triangle is valid if the sum of all the three angles is equal to 180 degrees.

Q/Write a program in C++ using function to calculate the volume of the sphere.

(Volume of sphere= , Note type of r should be float type).

Answer 1

what

Answer 2

Abdullah ibra 4 times the inverse tangent of 1 is pi.