A right rectangular pyramid is sliced through its vertex and perpendicular to its base as shown in the figure. What is the shape of the resulting two-dimensional cross section?

Triangle

Step-by-step explanation:

When you slice it in half, it becomes a triangle because the big equilateral triangle is turned into a right triangle.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

answer: procent 54 wynosi 33,33%