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Asked: 2021-03-23T09:47:48+00:00 In:

∆ABC is right angled at A (Fig 11.25). AD is perpendicular to BC. If AB = 5 cm, BC = 13 cm and AC = 12 cm, find the area of ∆ABC. Also, find the length of AD.

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∆ABC is right angled at A (Fig 11.25). AD is perpendicular to BC. If AB = 5 cm, BC = 13 cm and AC = 12 cm, find the area of ∆ABC. Also, find the length of AD.

NCERT Solutions for Class 7 Mathematics Chapter 11
Important NCERT Questions
Class vii Math Chapter 11 Perimeter and Area Exercise 11.2
NCERT Books for Session 2022-2023
CBSE Board
Questions No: 7

2020-2021cbsechapter 11class7mathematicsncertperimeter and area
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      In right angles triangle BAC, AB = 5 cm and AC = 12 cm
      Area of triangle = 1/2 x base x height = 1/2 x AB x AC
      = 1/2 x 5 x 12 = 30 cm²
      Now, in ∆ABC
      Area of triangle ABC = 1/2 x BC x AD
      ⇒ 30 = 1/2 x 13 x AD
      ⇒ AD = 30×2/13 = 60/13

      Class 7 Maths Chapter 11 Exercise 11.2

      for more answers vist to:
      https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-11/

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