Geometry Reference Materials Page 2
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2STAAR GEOMETRY
REFERENCE MATERIALS
COORDINATE GEOMETRY
(
)
x
x
y
y
+
+
Midpoint
1
2
1
2
,
2
2
2
2
Distance formula
d
(
x
x
)
(
y
y
)
=
−
+
−
2
1
2
1
y
y
−
2
1
m
=
Slope of a line
x
x
−
2
1
Slope-intercept form of a linear equation
y
mx
b
=
+
Point-slope form of a linear equation
y
y
m x
(
x
)
−
=
−
1
1
Standard form of a linear equation
Ax
By =C
+
RIGHT TRIANGLES
2
2
2
a
b
c
Pythagorean theorem
+
=
Trigonometric ratios
B
opposite leg
A =
sin
hypotenuse
adjacent leg
cos
A =
hypotenuse
opposite leg
A
C
tan
A =
adjacent leg
30° – 60° – 90° triangle
45° – 45° – 90° triangle
60°
45°
2x
x 2
x
x
30°
45°
x
x 3
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