Answer
(H) $4.41\times 10^5\;m^2$.
Work Step by Step
Height of the triangle $h=4.2\times 10^2 \;m$.
Base of the triangle $b=2.1\times 10^3\; m$.
Area of the triangle $A=\frac{1}{2}bh$.
Substitute both values.
$A=\frac{1}{2}(2.1\times 10^3\;m)(4.2\times 10^2\;m)$
Simplify.
$A=(2.1\times 10^3\;m)(2.1\times 10^2\;m)$
$A=4.41\times 10^5\;m^2$.
Hence, the correct option is (H) $ A=4.41\times 10^5\;m^2$.
