Question

Find the area of the circle, length of whose circumference is equal to the sum of the lengths of the circumferences with radius of 15 cm and 13 cm in $c{m}^2$

Answer 1

Total circumference $=2\pi$$\times 15+$$2\pi$$\times r13$

$=176$ cm

Circumference $=2\pi$$\times r$

$176=2\times$$\pi$$\times r$

$r=28$ cm

Area $=\pi$$\times r^2$

$=\pi$$\times {28}^2$

$=2464m^2$