The hardest material is diamond. The hardest artificial substance would wurtzite boron nitride. That's basically just man-made diamonds.
Answer:B
Explanation: I’m sure it is.
Answer:
A
D
E
and maybe C I'm not sure on that one.
Explanation:
Answer:
22/7 ×
Explanation:
The area of a circle can be found out using π. Since r is the radius so if they multiply, they will give you an area of a square then multiply by 22/7 since it is a circle.
answer i think your looking for unless your talking about something else