Geometry Memorization List Flashcards
Sum of Interior Angles for Triangle
180
Sum of Interior Angles for Quadrilateral
360
Sum of Interior Angles for Pentagon
540
Sum of Interior Angles for Hexagon
720
Equation to Find Degrees of Polygon with N Sides
(n-2) x 180
Area of a Triangle
1/2BH
Area of Rectangle
Length x Width
Area of Trapezoid
1/2(Base1 + Base2) x Height
Hypotenuse of Right Triangle with Pythagorean Theorem
a2 + b2 = c2
Diagonal of a Rectangular Solid with Deluxe Pythagorean Theorem
a2 + b2 + c2 = d2
Common Right Triangles
3-4-5; Key Multiples:6-8-10, 9-12-15, 12-16-20
5-12-13; Key Multiples: 10-24-26
8-5-17 (no key multiples)
45-45-90 Triangles: a-a-a√2; a2 +a2 = (a√2) 2 = 2a2
30-60-90 Triangles: a-a√3-2a; a2 +(a√3)2 =(2a) 2 = 4a2
Area of a Circle
πr2
Volume of Cylinder
πr2h
Diameter of a Circle
2r
Circumference of a Circle
2πr = πd
If one of the sides of an inscribed Triangle is a diameter of the circle (in which the triangle is inscribed)…
then the triangle must be a right triangle.
The exterior angle of a triangle is equal in measure to the…
the sum of the two non-adjacent
(opposite) interior angles of the triangle
If parallel lines are cut by a transversal…
, then all the acute angles that are formed will be equal,
so too will all the obtuse angles be equal.
Isosceles triangles have…
have both two sides that are equal and two angles that are equal
The slope intercept form of a line is…
y=mx + b (where m is the slope and b is the y-intercept).
You can calculate the slope intercept form of a line with…
just two points.
