Question

What is the length of diagonal, if area of a rectangle is 168 cm2 and breadth is 7 cm?

• A. 24 cm
• B. 15 cm
• C. 17 cm
• D. 25 cm

Answer 1

Answer:

D. 25 cm

Area of a rectangle = $Length\times{breadth}$

$⇒ 168 = Length\times{7}$

$⇒ Length =\frac{168}{7}$

⇒ Length = 24 cm

We know that,

Diagonal² = Length² + breadth²

⇒ Diagonal² = 24² + 7² = 576 + 49 = 625

∴ Diagonal = 25 cm