Triangles by Sides
How many sides does a triangle have?
3
What type of triangle has all angles less than 90 degrees?
acute triangle
What is a quarter of a circle called?
90 degrees
What do we call lines that never meet?
parallel lines
What do we call a four-sided figure?
quadrilateral
What type of triangle has one angle that is greater than 90 degrees?
obtuse triangle
What do we call a triangle with one right angle?
right triangle
If a circle is divided into 4 equal parts, what fraction does each part represent?
1/4
What type of lines meet at a right angle?
perpendicular lines
What is a quadrilateral with 2 sets of equal lines and 2 sets of parallel lines?
parallelogram
What do we call a triangle with all sides equal?
equilateral triangle
If a triangle has one angle that is greater than 90 degrees, what is it called?
obtuse triangle
How many degrees are in a full circle?
360 degrees
What do we call lines that intersect at any angle other than 90 degrees?
intersecting lines
What do we call a quadrilateral with four right angles and 2 sets of parallel lines?
rectangle
What type of triangle has no equal sides?
scalene triangle
How many degrees are in the sum of the angles of a triangle?
180 degrees
What is the measure of an angle that turns through 1/3 of a circle?
120 degrees
What type of line has no ends and goes on forever in both directions?
(hint: this equals 180 degrees)
line
What is the name of a quadrilateral with all sides equal and 4 right angles?
square
What is the name of a triangle with two sides of equal length?
isosceles
If one angle of a triangle is 60 degrees and another is 90 degrees, what is the third angle?
30 degrees
What is a measure of an angle that turns through 2/6 of a circle?
135 degrees
This type of line starts at a point and extends infinitely in one direction?
ray
If a quadrilateral has one pair of parallel sides, what is it called?
trapezoid