Geometry Flashcards
(12 cards)
1
Q
Area of a parallelogram
A
B x H
2
Q
Area of a Triangle
A
1/2 x BxH
3
Q
Intuition for why 1/2BH is the area of a triangle
A
A triangle is half as big as the rectangle that surrounds it!
Draw it:
- Split the triangle with a 90 degree vertical line
- Take the triangle portions and rotate 180 degrees.
- Combining with the original triangle makes a perfect rectangle every time!
4
Q
A slanted triangle
A
Still has an area 1/2 the parallelogram that surrounds it
5
Q
Radius
A
Half the width of a circle
Any outside point to the center
6
Q
Diameter
A
The distance across a circle through the center point
7
Q
Ratio of circumference to the diameter
A
Pi
8
Q
Circumference
A
Distance around the circle
9
Q
Pi
A
Circumference / Diameter
10
Q
Circumference Formula
A
Pi 2r = Pi D
Where D = diameter
Where r = radius
11
Q
Equation of Pi
A
C/D
Circumference / Diameter
12
Q
Area of a circle
A
Pi R^2
