Lessons 21-26
the distance around something
What is a perimeter?
any angle that is less than a right angle
What is an acute angle?
angles that are greater than right angles but less than a straight line
What is an obtuse angle?
the distance around a circle
What is a circumference?
What is a denominator?
a way to describe a relationship between numbers
What is a ratio?
where lines intersect
What are angles?
when lines do not cross but stay the same distance apart
What are parallel lines?
the distance across a circle through its center
What is a diameter?
What is a vertex
a ratio of measures
What is a rate?
when lines cross they...
What is intersect?
when lines intersect and make square angles
What are perpendicular lines?
the distance from the center to the circle's edge
What is a radius?
the smallest multiple two numbers have in common
What is the least common multiple (LCM)?
the product of a number when multiplied by any number (5x1=5, 5x2=10, 5x3=15, 5x4=20, ...)
What are multiples?
lines which intersect at a point but are not perpendicular
What are oblique lines?
a flat surface, such as a tabletop or a sheet of paper
What is a plane?
a tool for drawing a circle
What is a compass?
two numbers whose produce is 1 (2/1 x 1/2 = 1)
What is a reciprocal?
dividing a fraction until it reaches its simplest form
What is reducing?
a line with an endpoint at one end
What is a ray?
the square angles formed by perpendicular lines
What is a right angle?
a circle which has the same center as another (fits inside another circle)
What is a concentric circle?
numbers to deal with (fractions have two)