Step-by-step explanation:
Before we answer, the area of a Circle given it radius is

The area of a circle given it diameter is

So let answers question 1-4.
1. The area is

2. The area is

3.

4.

For the 5th problem, circumference is

where d is the diameter and

where r is the radius.
A circumference of 100 m means the radius is 50 because


So this means the area is

Answer:
128 degrees
Step-by-step explanation:
38+90=128
Answer:
I count 10 triangles.....
Answer:
Shoyo here!
Step-by-step explanation:
wow.
Answer: magnesium >potassium hope it helps