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Flashcards in Geometry Deck (12)
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1

Area of a parallelogram

B x H

2

Area of a Triangle

1/2 x BxH

3

Intuition for why 1/2BH is the area of a triangle

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

A slanted triangle

Still has an area 1/2 the parallelogram that surrounds it

5

Radius

Half the width of a circle
Any outside point to the center

6

Diameter

The distance across a circle through the center point

7

Ratio of circumference to the diameter

Pi

8

Circumference

Distance around the circle

9

Pi

Circumference / Diameter

10

Circumference Formula

Pi 2r = Pi D

Where D = diameter
Where r = radius

11

Equation of Pi

C/D
Circumference / Diameter

12

Area of a circle

Pi R^2