Question

An umbrella has $8$ ribs which are equally spaced. Assuming umbrella to be a flat circle of radius $45$cm, find the area between the two consecutive ribs of the umbrella. [Note: Take $\pi =3.14$]

• A. $794.8$ $c{m}^2$
• B. $794$ $c{m}^2$
• C. $794.2$ $c{m}^2$
• D. $794.3$ $c{m}^2$

Answer 1

The correct option is A $794.8$ $c{m}^2$

$\therefore$ Area between two consecutive ribs of the umbrella

$=\frac{1}{8}\times$ Area of circle

$=\frac{1}{8}\times \pi r^2$

$=\frac{1}{8}\times 3.14\times (45{)}^{2}c{m}^2$

$=794.8c{m}^2$.