1/4nr is the right answer i took the test
Step-by-step explanation:
Given
radius (r) = 1 cm
thita = 90°
We have the formula to calculate area of sector which is
Area = (thita/ 360°) πr²
= 90°/360° * 3.14 * 1²
= 0.25 * 3.14 * 1
= 0.785 cm²