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How many congruent sides does a triangular prism have?
A triangular prism has two congruent bases. This question was posed and answered on "Are You Smarter Than a Fifth Grader?"
How can we rewrite Euclid's fifth postulate?
Euclid's fifth postulate: If two lines are drawn which intersect a third in such a way that the sum of the inner angles on one side is less than two right angles, then the two lines inevitably must intersect each other on that side if extended far enough.It can be rewritten: If two lines are drawn which intersect a third at angles of 90 degrees, the two lines are parallel and will not intersect each other.It has also been rewritten as Playfair's axiom:In a plane, given a line and a point not on it, at most one line parallel to the given line can be drawn through the point.
If the pattern below follows the rule Starting with three every consecutive line has a number that is two less than twice the previous line how many marbles must be in the fifth line?
18
How many planes are determined by two intersecting lines?
One.
How many lines of symmetry does a recatangle have?
two Edit: Actually it has four - One vertical, one horizontal and two rotational lines at the diagonals !
