∆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.

Solution:

In right angled triangle BAC, AB = 5 cm, BC = 13 cm and AC = 12 cm.

Area of triangle BAC = 1/2 × Base × Height

= 1/2 × 5 cm × 12 cm

= 30 cm²

Area of triangle ABC = 1/2 × Base × Height 

Now BC = 13 cm

30 cm² = 1/2 × 13 cm × AD

AD = (30 cm² × 2) / 13 cm

AD = 60 cm² / 13 cm

AD = 4.61 cm

☛ Check: NCERT Solutions for Class 7 Maths Chapter 11

Video Solution:

∆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.

Class 7 Maths NCERT Solutions Chapter 11 Exercise 11.2 Question 7

Summary:

∆ABC is right angled at A. AD is perpendicular to BC. If AB = 5 cm, BC = 13 cm and AC = 12 cm. The area of ∆ABC is 30 cm². Also 4.61 cm is the length of AD.

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