Answer:

Step-by-step explanation:
Surface area of this shape = area of 2 triangles + area of 3 rectangles

That would be 6 just put the the whole number over one and keep flip change
Use the following identity:
cos(2x)=1-2sin^2(x)

The value of
.


We know that,

➪ 125° +
+ 30° = 180°
➪
+ 155° = 180°
➪
= 180° - 155°
➪
= 25°
Therefore, the value of
is 25°.
Now, the three angles of the triangle are 125°, 25° and 30°.

✒ 125° + 25° + 30° = 180°
✒ 180° = 180°
✒ L. H. S. = R. H. S.

