Answer:
Step-by-step explanation:
Divide diameter in half to get radius.
Area of circle is πr² in your case π = 3.14
1.
84/2 = 42 <-- radius
3.14 * 42²= 3.14 * 1764 = 5538.96mm²
2.
2.8/2 = 1.4 <-- radius
3.14 * 1.4²= 3.14 * 1.96 = 6.1544m²
3.
18/2 = 9 <-- radius
3.14 * 9²= 3.14 * 81 = 254.34cm²
4.
0.14/2 = 0.07 <-- radius
3.14 * 0.07²= 3.14 * 0.0049 = 0.015386m²
5.
17/2 = 8.5 <-- radius
3.14 * 8.5²= 3.14 * 72.25 = 226.865ft²
