Question

crater lake in oregon is shaped like a circle with a diameter of about 5.5 miles.
a. how far is it around the perimeter of crater lake? use π and round to the nearest whole mile.
miles
b. what is the area of the surface of crater lake? use π and round to the nearest whole square mile.
square miles
(lesson 3-10)

Explanation:

Step1: Find circumference formula

Circumference $C = \pi d$ (d=diameter)

Step2: Calculate circumference

$C = \pi \times 5.5 \approx 17.2788$ → round to 17

Step3: Find radius

$r = \frac{d}{2} = \frac{5.5}{2} = 2.75$

Step4: Calculate area

Area $A = \pi r^2 = \pi \times (2.75)^2 \approx 23.7583$ → round to 24

Answer:

17 miles
24 square miles