Question

Earth has a radius of about 6.4 x 10^6m. Approximate the surface area of Earth using the formula for the surface area of a sphere. S=4*pi*r^2

Answer 1

r=6.4*10^6

know some things
(x^m)(x^n)=x^(m+n)


so


S=4pir^2
S=4pi(6.4*10^6)^2
S=4pi(6.4*10^6)(6.4*10^6)
S=4pi(6.4)(6.4)(10^6)(10^6)
S=4pi(40.96)(10^12)
S=163.84pi(10^12)
aprox
S=514.71854036415172418971949191651 times 10^12 m²