The diagram shows a cone and its axis of rotation. Which type of cross section is formed when the cone is intersected by a plane containing the axis of rotation? A. a circle B. an isosceles triangle C. a parabola D. an oval

B. an isosceles triangle

Step-by-step explanation:

As we know that

When a plane moves through the cone's axis of rotation, then the resulting cross-section is a triangle with one vertex as the cone's vertex and the triangle's two sides through the vertex A are identical.

Where the base of the triangle is equivalent to the circular base diameter of the cone, and the two congruent sides of the triangle are equivalent to the slant height of the cone

Hence, the correct option is B.

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

Answer is a not really sure tho