Question

4. In AABC, 2C= 2A and BC = 4 cm and AC = 5 cm, then find length of AB. (a) 5 cm (b) 3 cm (c) 4 cm (d) 2.5 cm​

Answer 1

Answer:

5

Step-by-step explanation:

2C= 2A

therefore, C=A

If C=A, then AB=AC (property of isosceles trianle)

AB=AC

therefore, AB= 5

Answer 2

Answer:

Henceinrightangled △ADC

AC

2

=AD

2

+DC

2

(PhythagoreasTheorm)

⇒AD

2

=AC

2

−DC

2

⇒AD

2

=(2.5)

2

−(2)

2

⇒AD

2

=6.25−4

⇒AD

2

=2.25

⇒AD=1.5

Step-by-step explanation:

hope it is helpful