Which sentence best defines parallel lines? A. Parallel lines are lines that intersect at 90 degree angles.
B. Parallel lines are lines in the same plane that do not intersect.
C. Parallel lines are lines that are noncoplanar and do not intersect.
D. Parallel lines are lines that occupy the same space and have all their points in common.
E. Parallel lines are lines that intersect to form angles with measures not equal to 90 degrees.

If the perimeter of the base of the regular quadrilateral pyramid is P = 30 cm. and  the perimeter of a lateral face is 27.5 cm then sum of all edges of this pyramid is 110cm

A pyramid with square base is known as regular quadrilateral pyramid.

We know that perimeter of base of  regular quadrilateral pyramid is equal to 4 times side of base

So side of base can be calculated as :

Side = 30/4

side = 15/2

Side = 7.5 cm

We know perimeter of lateral face is equal to side of base + 2 side of  lateral face.

Hence  2 side of  lateral face = perimeter of lateral face  - side of base

2 side of lateral face= 27.5-7.5=20

side of lateral face=20/2 =10

Sum of all edges = 4  Side of lateral face+ 4  Side of base

=410+ 47.5=70 cm

If the perimeter of the base of the regular quadrilateral pyramid is P = 30 cm. and  the perimeter of a lateral face is 27.5 cm then sum of all edges of this pyramid is 110cm

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