Triangles
A triangle with at least two equal sides
What is an isosceles triangle?
T/F: Quadrilaterals are polygons.
True
A part of a line with one end point
What is a ray?
Perpendicular lines create this.
What is a right angle?
Intersecting lines form two sets of these.
What are vertical (opposite) angles?
A triangle with no equal sides
What is a scalene triangle?
A quadrilateral with at least one pair of parallel sides.
What is a trapezoid?
Two rays with the same endpoint
What is an angle?
These lines will never intersect.
What are parallel lines?
On a straight line, there are 3 angles with the same vertex. Angle a =75 degrees, angle b=76 degrees. This is the measure of angle c.
What is 29 degrees?
A triangle with all 60 degree angles
What is an equilateral (or acute) triangle.
A parallelogram with four right angles
What is a rectangle?
Part of a line contained between two points
What is a line segment?
A line that intersects two parallel lines.
What is a transversal?
The distance around the circle is called this.
What is the circumference?
T/F: A triangle can have one or more obtuse angles.
False. It can only have one obtuse angle.
A parallelogram with four congruent sides
What is a rhombus?
A little more to think about:
Rhombus vs. Rectangle:
A rectangle has 4 congruent angles (all 90 degrees), but its sides don't all have to be equal.
A rhombus has 4 congruent sides, but its angles don't all have to be equal.
A square has both: 4 congruent sides and 4 congruent angles (making it both a rhombus and a rectangle).
The point where an angle is formed
What is a vertex?
Two quadrilaterals that contain right angles.
What are a rectangle and a square?
An isosceles triangle has two angles measuring 35 degrees each. The measure of the third angle is this.
What is 110 degrees?
Two ways to classify triangles
What are sides or angles?
The sum of the angles of a quadrilateral equals this.
What is 360 degrees?
Two rays that share the same endpoint and extend in completely opposite directions to form a straight line.
opposite rays
Free Points!
YAY!
In parallelogram ABCD, angles B and C will have a sum of this.
What is 180 degrees?