Explanation:

 Given that, area = 24 sq cm, perpendicular (p) = 10 cm, base (b) =?
According to the question,
∴ Area = 1/2 × base × height (perpendicular) = 1/2 × b × p
⇒ 24 = 1/2 × b × 10
∴ b = (2 × 24)/10 = 48/10 = 4.8 cm