WAEC - Mathematics (2016 - No. 6)
On a map, 1cm represent 5km. Find the area on the map that represents 100km2.
2cm2
4cm2
8cm2
8cm2
Vysvetlenie
On a map, 1cm represents 5km. Then it follows that 1cm2 represents 25km2. Acm2 represents 100km2. By apparent cross-multiplication, 1cm2 x 100km2 = Acm2x 25km2
therefore A = \(\frac{100}{25}\) = 4cm2
therefore A = \(\frac{100}{25}\) = 4cm2