7th grade math Flashcards
an equation showing that two ratios are equal is a
proportion
the coordinates of a point on a grid are written as an
ordered pair
a special ratio that compares a number to 100 and uses the symbol%
percent
the set of whole numbers and their opposites, the number -3 is an
integer
Write the following decimals as percents: 1. .77 2. .06 3. 0.9 4. 1.04
- 77% 2. 6% 3. 90% 4. 104%
Write the following percents as decimals: 1. 42% 2. 80% 3. 1% 4. 131%
- .42 2. .8 3. .01 1.31
What is 10% of 40
4
What is 12% of 100
12
What is 99% of 60?
59.4
What is 100% of 81?
81
What is 45% of 360?
162
a base-10 place value system
decimal system
an exact spot usually represented by a dot
point
a straight path that has no thickness and extends forever in opposite directions, 2 points
line
a flat surface that has no thickness and extends forever, 3 points
plane
a part of a line with one end point, extends forever in one direction
ray
a part of a line with two definite endpoints
line segment
figures with the same shape and size
congruent
How can you indicate congruent lines?
tick marks
What is the tool used to measure angles?
protractor
two angles that add up to a 90 degree angle
complementary angles
two angles that add up to 180 degrees
supplementary
How many degrees are in a straight line?
180
two rays with a common endpoint
angle
the common endpoint of two rays forming an angle is called what
vertex
angles are measured in what units
degrees
What is a right angle?
90 degrees
angles less than 90 degrees
acute
angles more than 90 degrees
obtuse
angle that equals 180 degrees
straight angle
line in the same plane that never cross
parallel
when two parallel lines are intersected by a third line, what is the third line called?
transversal
Name all the interior angles.
Name the exterior angles.
Which angles are alternate interior angles?
c and f
d and e
What are the alternate exterior angles?
What are the corresponding angles?
Are they congruent?
the angles in the same position relative to the parallel lines
yes
if the angles formed by two intersecting lines measures 90 degrees, what are the lines
perpendicular
lines that don’t intersect but aren’t parallel
skew
angles with a common vertex, a common side but no common interior points
adjacent
the opposite angles formed by two intersecting lines
Are they congruent?
vertical angles
yes
The sum of the angles in a triangle equals what?
What is the missing angle?
180 degrees
a line segment that connects two non-adjacent angles of a polygon
diagonal
the sum of all the angles in a quadrilateral equals what
360 degrees
