Question

in the figure angle B=90degree ,angle A=angle C and BC=10cm,then find the value of tan 45degree​

Answer 1

Answer:

Draw a right angled △ABC using given instructions:

Here sin30=

AC

BC

2

1

=

20

BC

Or BC=10 cm

By Pythagoras theorem:

(AB)

2

=(AB)

2

−(BC)

2

=(20)

2

−(10)

2

=300

AB=10

3

cm.

solution

Answer 2

Let angle be angle A and Tan A be 45°

therefore angle A = 45°

Tan 45= opposite side/ adjacent side

= BC/AB

1 = 10/AB

1 × AB = 10

Therefore AB= 10