Question

AABC is right angled at C. IF AC = 5cm and BC= 12 cm find the
length of AB.​

Answer 1

Answer:

Vector Addition

REF.Image

Given , ΔABC is right angled at C.

AC=5cm

BC=12cm

AB=?

Using Pythagoras theorem.

REF.Image

c2=a2+b2

c=a2+b2

so in ΔABC

AB=(AC)2+(CB)2

AB=(5)2+(12)2

AB=25+144

AB=169

AB=13cm

Answer 2

Vector Addition

REF.Image

Given , ΔABC is right angled at C.

AC=5cm

BC=12cm

AB=?

Using Pythagoras theorem.

REF.Image

c

2

=a

2

+b

2

c=

a

2

+b

2

so in ΔABC

AB=

(AC)

2

+(CB)

2

AB=

(5)

2

+(12)

2

AB=

25+144

AB=

169

AB=13cm