WAEC - Mathematics (2019 - No. 29)
A rectangular board has a length of 15cm and width x cm. If its sides are doubled, find its new area.
60x cm\(^2\)
45x cm\(^2\)
30x cm\(^2\)
15x cm\(^2\)
คำอธิบาย
New are = (2 x 15) x (2 x \(x\))
= 60cm\(^2\)
New are = (2 x 15) x (2 x \(x\))
= 60cm\(^2\)