Geometry Flashcards
collinearity
Collinear. Three or more points , , , …, are said to be collinear if they lie on a single straight line. . A line on which points lie, especially if it is related to a geometric figure such as a triangle, is sometimes called an axis. Two points are trivially collinear since two points determine a line.
Can we assume that a line is straight if the line goes through points A & B & C?
if the line goes through points A & B & C, and it looks like those three points are “collinear,” then they indeed are, and the line is straight.
What is a regular polygon?
regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length). Regular polygons may be either convex or star.
What is a convex quadrilateral?
A convex quadrilateral is a four sided polygon that has interior angles that measure less than 180 degrees each.
What does it mean to inscribe a polygon?
To inscribe a polygon in a circle, the polygon is placed inside the circle so that all the vertices of the polygon lie on the circumference of the circle.
What can we conclude when we know that two sides are equal to each other in a triangle?
That the two angles of the side with equal length that toch the third side are equal too.
–> and vice versa (from equal angles to equal sides)
What is there to know abou the surface area of small and large objects
Small or thin objects have a large surface area compared to the volume. This gives them a large ratio of surface to volume. Larger objects have small surface area compared to the volume so they have a small surface area to volume ratio.
