Question

name some regular closed figure ​

Answer 1

Answer:

Heya mate✌✌✌

Some regular closed figures are :-

• Square
• Rectangle
• Triangle
• Parallelogram
• Rhobmus
• Circle
• Cone
• Cube
• Cuboid

Hope it helps✌✌✌

Answer 2

Answer:

Step-by-step explanation:

For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom.