Question

three planes intersect in
select one:
a. a plane
b. a point
c. a line segment

the segment joining the two legs of a trapezoid is called
select one:
a. a base
b. an altitude
c. a median

Explanation:

For the first question: Three distinct planes can intersect at a single common point when they are not all parallel and do not share a common line or plane.
For the second question: The segment connecting the two legs (non-parallel sides) of a trapezoid is its median (also called the midsegment), which is parallel to the bases and has a length equal to the average of the base lengths.

Answer:

1. b. a point
2. c. a median