Question

the sides of a rectangle are 15cm and 20cm respectively find the length of its diagonal ​

Answer 1

Gɪᴠᴇɴ :-

• Length (l) = 15 cm
• Breadth (b) = 20 cm

ᴛᴏ ғɪɴᴅ :-

• Diagonal (d) of rectangle

sᴏʟᴜᴛɪᴏɴ :-

On using Pythagoras theorem,we get,

➭ Diagonal² = Length² + breadth²

➭ d² = l² + b²

➭ d² = 15² + 20²

➭ d² = 225 + 400

➭ d² = 625

➭ d = √625

➭ d = 25 cm

Hence,

• Diagonal (d) of rectangle is 25 cm

More Formulas :-

• Area = length²
• Perimeter = 2(length + breadth)
• Diagonal = √(length² + breadth²)

Answer 2

⭐ Given :-

• Length Of Rectangle = 15cm.
• Breadth Of Rectangle = 20cm.

⭐ To Find :-

• Diagonal.

⭐ Solution :-

We know the Formula that,

Diagonal = √l² + h²

Put the values.

➝ Diagonal = √15² + 20²

➝ Diagonal = √225 + 400.

➝ Diagonal = √625.

➝ Diagonal = 25cm.

Hence, The Value Of Diagonal = 25cm.

⭐ Some Important Formulae :-

• Area Of Rectangle = l × b.

• Perimeter = 2(l + b).