Geometry Flashcards
Sum of Interior Angles
(n-2) x 180 = Sum of Interior Angles of a Polygon
Area of a Trapezoid
Average of Bases x Height
Surface Area of a Retangular Solid
Sum of all sides
6 sides
Volumne of a Retangular Solid
Length x Width x Height
Maximum and Minimum Triangle Sides
Think of a straight line
The third side has to be longer than the difference of the two other sides
(too small and it would be a straight line going inwards)
AND
the third slide but be smaller than the two sides added together
(too side and it would be a straight going outwards line)
What are thre three common right triangles?
3-4-5
(6-8-10)
(9-12-15)
(12-16-20)
5-12-13
10-24-36
8-15-17
What are the side lengths of an equalateral triangle?
x (30o)
x√3 (60o)
2x (90o)
Area of a Triangle
(Base x Height) / 2
or 1/2 of a square
Exterior Angles of a Triangle
Area of a Circle
A = π x Radius2
Circumference of a Circle
C = π x Diameter
What is the relationship between an inscribed and central angle of a circle?
An inscribed angle is an angle that has a vertex on the circle itself
A central angle has a vertex that is the center of the circle
The inscribed angle is 12/ the size of arc it intecetps
Inscribed triangle in a circle
If there is an inscrbied triangle in a circle, the triangle is a 90o triangle
Volumne of a Cylinder
V = π x Radius2 x Height
Coordinate Plane
II I
III IV
Forumla for Slope
“Rise over Run”
Y2 - Y1
X2 - X1
What is the slope-intercept form fro a line with the equation 6x + 3y = 18?
6x + 3y = 18
3y = 18 - 6x
y = 6 - 2x
y = -2x + 6
Slope = -2
What is the distance between (1,3) and (7,-5)
Use pythagorean theorem
Rise = Difference in Y values
Run = Difference in X values
Length of a diagonal
w2 + l2 + h2 = d2
