Hello, please can you help me solve these math problems i am having some trouble.
Q1. a circle has an area of 98mm(squared).
Calculate the circumference of the circle.
The picture for question 2 is attached to this message sorry about the bad drawing.
Q2. Calculate the shade area
I really appreciate anyone who can help me with this thanks in advance.
If you want baby steps... read here:Q1. a circle has an area of 98mm(squared).
Calculate the circumference of the circle.
Can you solve a system of equations? That's what this method is going to be.
So the area of a circle is:
Then we know: [1]
The circumference of a circle is: [2]
So to find the circumference, we need to know the r.
So we solve equation [1] for r:
Now you have r, so solve [2] by subbing our new r value in the equation:
We're not allowed to have a sqrt on the bottom, so we multiply the top and bottom by :