Question

Find the are of circular ring whose outer diameter d =38mm inner diameter d =32mm

Answer 1

Answer:

Here is your answer.

Step-by-step explanation:

Let the circle with the bigger diameter have radius "R"

Thus, the radius of the circle with smaller dia. is "r"

R = 38/2 = 19mm

r = 32/2  = 16mm

Thus, the formula for the area of the ring = $\pi (R^{2} - r^{2})$

Plugging in the values, we get => $\frac{22}{7} (19^{2} - 16^{2})$

Solving further = $\frac{22}{7}(105)$

                         = 330

Thus, the area of the ring = $330 mm^{2}$

Hope it helps!