Planning & EstimatingQuestion 71 of 100
To find the area of a circular planting bed with a 20-foot diameter, which calculation is correct?
a.20 x 20
b.3.14 x 20
c.2 x 3.14 x 10
d.3.14 x 10 x 10 (about 314 square feet)
Explanation
Circle area equals pi times the radius squared, and the radius is half the diameter, so 10 feet. Thus 3.14 x 10 x 10 equals about 314 square feet. Using diameter instead of radius is a common estimating error.
Practice all 100 questions free — no signup required.
Related questions on this topic
- How many cubic yards of soil are needed to cover a 30 ft by 18 ft bed 6 inches deep?
- The formula for calculating cubic yards of bulk material for a rectangular area is which of the following?
- A mulch supplier sells by the cubic yard. To mulch 900 square feet at 3 inches deep, how many cubic yards are required?
- A landscape plan uses a scale of 1 inch = 10 feet. A bed measures 4 inches long on the plan. What is its actual length?
- A patio is 12 ft by 15 ft and will be poured 4 inches thick. How many cubic yards of concrete are needed (before waste)?
- When estimating a job, which cost category covers wages, taxes, and workers' compensation for crew hours?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-27 Landscaping Trade Exam · How we review