What is the area of a circle with radius 0.5 units?

What is the area of a circle with radius 0.5 units?

• A. 0.7854
• B. 1.5708
• C. 0.3927
• D. 0.6283

Answer: (A)

Area is found using A = πr^2. With a radius of 0.5 units, r^2 = 0.25, so A = π × 0.25 = 0.25π ≈ 0.7854 square units. This is the exact value expressed numerically as 0.7854, matching the given result. The other numbers would come from using a different radius or a misapplication of π, not from the correct radius value.

Area is found using A = πr^2. With a radius of 0.5 units, r^2 = 0.25, so A = π × 0.25 = 0.25π ≈ 0.7854 square units. This is the exact value expressed numerically as 0.7854, matching the given result. The other numbers would come from using a different radius or a misapplication of π, not from the correct radius value.