Lines
two lines that are the same distance apart and will never touch
What are parallel lines?
an angle that equals 90 degrees
What is a right angle?
a triangle that has all 3 sides equal in length
What is an equilateral triangle?
the number of sides in a quadrilateral
What is 4?
a plane figure with 8 sides and 8 angles
What is a octagon?
two lines that intersect to form a right angle
What are perpendicular lines?
an angle that is less than 90 degrees
What is an acute angle?
a triangle that has only 2 sides equal in length
What is an isosceles triangle?
a quadrilateral with only one pair of opposite sides parallel
What is a trapezoid?
a plane figure with 6 sides and 6 angles
What is a hexagon?
two lines that cross and form 2 acute and 2 obtuse angles
What are intersecting lines?
an angle that is greater than 90 degrees
What is an obtuse angle?
a triangle with no sides equal in length
What is a scalene triangle?
a quadrilateral with 2 pairs of opposite sides parallel and equal in length, and 4 right angles
What is a rectangle?
a plane figure with 5 sides and 5 angles
What is a pentagon?
part of a line
What is a line segment?
an angle that equals 180 degrees
What is a straight angle?
a triangle with a 90 degree angle
What is right triangle?
a quadrilateral with two pairs of opposite sides parallel, all 4 sides equal in length, and 4 right angles
What is a square?
a plane figure with 10 sides and 10 angles
What is a decagon?
a straight one-dimensional figure made of many points that extend endlessly in both directions
What is a line?
A boat has a sail with one pair of perpendicular lines, and two sides the same length. What kind of triangle is it? Give 2 names.
What is a right isosceles triangle?
a triangle with one angle greater than 90 degrees
What is an obtuse triangle?
a quadrilateral with 2 pairs of opposite sides parallel, all 4 sides equal in length, and 2 acute and 2 obtuse angles
What is a rhombus?
a closed plane figure made of 3 or more straight sides
What is a polygon?