i dont know how to find the radius

2.5 cm

Step-by-step explanation:

Since they give you the height of the button, it is the same as the diameter.  The diameter is 2 as big as the radius so, we need to divide 5 by 2 to get the radius.

Example:  The diameter is 6, find the radius

To find the radius, divide 6 by 2

6 / 2

3 is the radius

The Actual Problem:  

Step 1:  Find the radius by dividing 5 by 2

5 / 2

2.5 cm is the radius

 2.5 cm

The height of the circle can also be classified as the diameter. The radius of a circle is the length of the midpoint to the end of the circle. The radius is half the diameter, so, we can divide.

5 / 2 = 2.5cm. is the radius

Best of Luck!

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.