Question

20 multiple choice 1 point calculate the area of a circular plastic kiddie pool that has a 5 foot radius. round to the nearest tenth of a foot. note area of a circle formula a = πr² a = area π ≈ pi - 3.141592... r = radius 78 square feet 78.5 square feet 50 square feet 28.2 square feet 21 multiple choice 1 point calculate the area of a circular plastic kiddie pool that has a 3 foot radius. round to the nearest tenth of a foot. note area of a circle formula a = πr² a = area π ≈ pi - 3.141592... r = radius 28 square feet 28.3 square feet 19 square feet 28.2 square feet 22 multiple choice 1 point the pie chart below illustrates how ethan divides his free time in a week. ethans weekly activities (pie chart with video games (yellow) and other activities (blue)) ethan spends 1/5 of his time playing video games. what percentage of his time is used for all the remaining activities? 75% 60% 85% 80%

Explanation:

Step1: Substitute r=5 into area formula

$A = \pi(5)^2 = 25\pi$

Step2: Calculate and round to nearest tenth

$25\pi \approx 25×3.1416 = 78.54 ≈ 78.5$

Answer:

B. 78.5 square feet