Geometry Flashcards
(17 cards)
What is the sun of the interior angles of a polygon with n sides?
Sum = (n-2)*180
Triangle = 180, square = 360
What relationship is always true for all triangles?
Sum of the lengths of 2 sides is greater than that of the third
What is true of an isosceles triangle?
If 2 sides are the same length, 2 angles are the same as well
And vice versa
What is the side relationship of a 45:45:90 triangle?
1:1:sqrt(2)
What is the relationship of sides in a 30:60:90 triangle?
1:sqrt(3):2
What is the area of a triangle?
Area = 1/2 base*height
What is the area of a parallelogram?
Area = height * width
What is the area of a trapezoid?
Area = 1/2 (base 1 + base 2)*height
What is the circumference of a circle?
2pir
What is the area of a circle?
Area = pi*r^2
What is a circumscribed polygon?
Polygon with a circle inscribe inside of it
What is an inscribed polygon?
A polygon with inscribed in a circle
What is true if a right triangle is inscribed in a circle?
The hypotenuse is the diameter
What is the volume of a cube?
V = base* width* height
What is the surface area of a cylinder?
SA = 2pi(r^2) + 2pir*h
What is the volume of a cylinder?
V = pi * r^2*h
What is the volume of a cone?
V = 1/3pih*r^2
