Question

From the triangle ABC, If angle B = 90° and AB = 3 cm, BC = 4 cm, then ?

OPTIONS :
1) sin A = 4/5
2) cos C = 4/5
3) tan A = 4/3
4) cot C = 3/4

It will be helpful if you guys give me the answer with steps of explanation ​

Answer 1

Answer:

2) cos c=4/5

Step-by-step explanation:

a=4cm,b=5cm,c=3cm

cosc=

2ab

a

2

+b

2

−c

2

=

2(20)

16+25−9

=

40

32

=

5

4

Answer 2

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