Shapes and angles
How many degrees are in a right angle?
90 degrees
What is the formula for the area of a rectangle?
A equals l x w
A flat surface that goes on forever in all directions
plane
a shape with 4 equal sides and 4 right angles?
square
A solid shape with 6 equal square faces
cube
What do we call and angle that is less than 90 degrees?
Acute angle
What is the formula for the area of a triangle?
A equals 1/2 x b x h
A part of a line that has one endpoint and goes on forever.
Ray
a shape with 3 sides
triangle
A 3D shape with 1 circular base and a curved surface that meets at a point
cone
what do we call an angle that is more than 90 degrees but less than 180 degrees?
obtuse angle
what is the formula for the perimeter of a square?
P equals 4 x s
Two lines that neve meet are called what?
Parallel lines
a shape with 5 sides
pentagon
A shape with 2 circular bases connected by a curved surface
cylinder
If two angles add up to 90 degrees, what are they called?
what is the formula for the circumference of a circle?
C equals 2πr or πd
The point where two lines meet to form an angle
Vertex
a shape with 8 sides
Octagon
a shape with flat faces that are triangles and one vertex at the top
pyramid
What is the measure of each angle in an equilateral triangle?
60 degrees
What is the formula for the area of a circle
A equals πr2
What do we call two angles that add up to 180 degrees?
Supplementary angles
a 4 sided shape with opposite sides parallel but angles not 90 degrees
Padallelogram
A round 3D object where every point on the surface is the same distance from the center
sphere