The correct answer is:
693 cm²
Explanation:
Since the ribs are equally spaced, so the angle made by two consecutive ribs at the centre
=($\displaystyle \dfrac{45}{3600}$ × $\displaystyle \dfrac{22}{7}$ ​× 42 × 42 )cm² = 693 cm²
693 cm²
Explanation:
Since the ribs are equally spaced, so the angle made by two consecutive ribs at the centre
=($\displaystyle \dfrac{45}{3600}$ × $\displaystyle \dfrac{22}{7}$ ​× 42 × 42 )cm² = 693 cm²