Question

Q.15 In right triangle, LB = 90" ,AB = 24 cm, BC = 7 cm, then cos C =​

Answer 1

Answer:

R.E.F image

In Δ ABC, B is at right angle.

Given, AB=24cm

BC=7cm

using Pythagoras theorem

AB

2

+BC

2

=AC

2

⇒(24)

2

+(7)

2

=AC

2

⇒AC=

(24

2

)+(7)

2

=

576+49

=

625

⇒AC=25CM

(i)sin A=

AC

BC

=

25

7

cos A=

AC

AB

=

25

24

(ii)sin C=

AC

AB

=

25

24

cos c=

AC

BC

=

25

7