Question

each circle is labeled with its radius. find the diameter of each circle. lets look at one circle at a time. remember, the diameter is the length of 2 radii. what is the diameter of the first circle?

Explanation:

Step1: Recall radius - diameter relationship

The diameter $d$ of a circle is related to the radius $r$ by the formula $d = 2r$.

Step2: Calculate diameter for the first circle

For the first circle with radius $r_1=1.75$ in, using the formula $d_1 = 2r_1$, we substitute $r_1 = 1.75$ in. So $d_1=2\times1.75 = 3.5$ in.

Step3: Calculate diameter for the second circle

For the second circle with radius $r_2 = 78$ in, using the formula $d_2=2r_2$, we substitute $r_2 = 78$ in. So $d_2 = 2\times78=156$ in.

Step4: Calculate diameter for the third circle

For the third circle with radius $r_3 = 14$ in, using the formula $d_3 = 2r_3$, we substitute $r_3=14$ in. So $d_3=2\times14 = 28$ in.

Answer:

For the circle with radius 1.75 in, the diameter is 3.5 in; for the circle with radius 78 in, the diameter is 156 in; for the circle with radius 14 in, the diameter is 28 in.