221 Geometry
Brunswick High School
Midterm Exam Formula
Geometry Midterm Exam Formula
Segment Addition Postulate: Little + Little = Big (LM + MO = LO)
The pink lines represent that both segments LM and MO are congruent or equal. Both segment LM
and MO added together will equal the whole segment LO.
Distance Formula: (xโ , yโ) (xโ , yโ)
๐= (๐ฅโ , ๐ฅโ)2+(๐ฆโ , ๐ฆโ)2
The distance formula can be used to ๏ฌnd the distance between two coordinates on a coordinate
plane.
Midpoint Formula:
2โข (๐ฅโ+ ๐ฅโ)
2, 2โข (๐ฆโ+ ๐ฆโ)
2
The midpoint formula is used to ๏ฌnd the middle point of two end coordinates. For example, ๏ฌnding
the midpoint of point a and point b.
Partitioning Ratio: 1 : 2 โ ๐
๐โ๐
๐+๐ โ 1
3
๐ฅ=๐ฆ+๐ (๐ฅโ๐ฆ)
๐ฆ=๐ฆ+๐ (๐ฅโ๐ฆ)
