Question

each circle is labeled with its radius. find the diameter of each circle.

Explanation:

Step1: Recall the relationship between radius and diameter

The diameter $d$ of a circle is twice the radius $r$, i.e., $d = 2r$.

Step2: Calculate diameter for the first - circle

For the circle with radius $r_1=1.4$ in, using the formula $d = 2r$, we have $d_1=2\times1.4$ in.
$d_1 = 2.8$ in.

Step3: Calculate diameter for the second - circle

For the circle with radius $r_2 = 0.78$ in, using the formula $d = 2r$, we have $d_2=2\times0.78$ in.
$d_2=1.56$ in.

Step4: Calculate diameter for the third - circle

For the circle with radius $r_3 = 1.75$ in, using the formula $d = 2r$, we have $d_3=2\times1.75$ in.
$d_3 = 3.5$ in.

Answer:

The diameters are 2.8 in, 1.56 in, and 3.5 in.