Answer:

Step-by-step explanation:
The given triangle is isosceles. Therefore the base angles are equal.
This implies that,
.
To find
we add the interior add angles and equate to
.
This implies,

We substitute to obtain,

We evaluate to obtain,



We divide through by 3 to get.

The correct answers would be the letter C
Answer:
25
Step-by-step explanation:
Answer:
The shape is plane, a rectangle
Step-by-step explanation:
The external figure, the cylinder is a rectangle in a two dimensional plane, so the cross section between two rectangles is also a rectangle