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Doctors Medicines MCQs Q&A

  1. 40 cm
  2. 70 cm
  3. 60 cm
  4. 50 cm
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1 Answers

Option 3 : 60 cm

Given:

The sides of the right angles = 15 cm and 20 cm

Formula used:

By Pythagoras theorem,

AC2 = AB2 + BC2

Calculation:

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Let AB and BC be 15 cm and 20 cm respectively

According to the question

By Pythagoras theorem,

AC2 = AB2 + BC2

⇒ AC2 = (152 + 202)

⇒ AC2 = (225 + 400)

⇒ AC2 = 625

⇒ AC = 25 cm

Now,

Perimeter of right-angled triangle = (AB + BC + AC)

⇒ (15 + 20 + 25) cm

⇒ 60 cm

∴ The required perimeter is 60 cm

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