11)

Triangle are congruent.

Observe the triangles,

The two triangle sides are equals.

Since,

Find .

The value of

12)

Triangle are congruent.

Observe the triangles,

The two triangle sides are equals.

Since,

Find

The value of

13)

Triangle are congruent.

Observe the triangles,

The two triangle sides are equals.

Since,

The equations are

Find

The value of

14)

Triangle are congruent.

Observe the triangles,

The two triangle angle are equals.

Since,

Find

The value of

15)

Triangle are similar.

Observe the triangles,

Since,

The equations are 

Find

The value of

16)

Triangle are similar.

Observe the triangles,

Since,

The equations are 

Find

The value of