Question

Please help(:
Two planes intersect to ____ form a line
A. Always
B. Sometimes
C. Never.
D. Inconclusive.

Which of the following is true?
A. All quadrilaterals are polygons with two pairs of parallel sides.
B. All quadrilaterals are polygons with four sides.
C. All quadrilaterals are polygons with at least one pair of parallel sides.
D. All quadrilaterals are polygons with four sides at least one pair of parallel sides.

Answer 1

the first one is A because planes are parallelograms and when two parallelogram intersect they always form a line
the second one is D since a trapezoid is a quadrilateral with at least one pair of parallel sides

Answer 2

thank you(: