Question

2. In the figure (B=90, LA=LC & BC=10 cm
then find the value of tan 45 ?​

Answer 1

Answer:

Hey there!

Given,

Angle B = 90°

So, AC is the Hypotenuse.

From the question, Hypotenuse = AC = 20 =

cm.

Now, Given Angle A = 30° =

Apply sine

sinA = sin30

sinA = 1/2

But, We know that, sinA = Opposite side to A/ = Hypotenuse.

Opposite side to A is BC.

Now,

sinA = BC / AC

1/2 = BC / 20

BC = 10cm.

In the same way,

Apply cosine

COSA = cos30

COSA = v3/2

We know that, Adjacent side of A = AB

Now, cosA = AB/AC

V3/2 = AB/AC

V3/2 (20 ) = AB

10v3 = AB

::. BC = 10cm, AB = 1073 cm