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12 Assessment Guide for Educators: Mathematical Reasoning Chapter 1: Assessment Targets GED® T est Mathematics Formula Sheet8 GEDtestingservice.com | GED.com GED® and GED Testing Service® are registered trademarks of the American Council on Education. They may not be used or reproduced without the express written permission of ACE or GED Testing Service. The GED® and GED Testing Service® brands are administered by GED Testing Service LLC under license from the American Council on Education. Copyright © 2015 GED Testing Service LLC. All rights reserved. Mathematics Formulas Sheet Mathematics Formula Sheet
Area of a:
square A = s2
rectangle A = lw
parallelogram A = bh
triangle A =
1
2 bh
trapezoid A =
1
2 h(b1 + b2)
circle A = πr2
Perimeter of a:
square P = 4s
rectangle P = 2l + 2w
triangle P = s1 + s2 + s3
Circumference of a circle C = 2πr OR C = πd; π ≈ 3.14
Surface area and v olume of a:
rectangular prism SA = 2lw + 2lh + 2wh V = lwh
right prism SA = ph + 2B V = Bh
cylinder SA = 2πrh + 2πr2 V = πr2h
pyramid SA =
1
2 ps + B V =
1
3 Bh
cone SA = πrs + πr2 V =
!
! πr2h
sphere SA = 4πr2 V =
4
3 πr3
(p = perimeter of base with area B; π ≈ 3.14)
Data
mean mean is equal to the total of the values of a data set, divided by
the number of elements in the data set
median median is the middle value in an odd number of ordered values
of a data set, or the mean of the two middle values in an even
number of ordered values in a data set
Algebra
slope of a line
m =
y2 – y1
x2 – x1
slope-intercept form of the equation
of a line
y = mx + b
point-slope form of the equation of a
line
y – y1 = m(x – x1)
standard form of a quadratic equation y = ax2 + bx + c
quadratic formula
x = –b ± b2– 4ac
2a
Pythagorean theorem a2 + b2 = c2
simple interest I = Prt
(I = interest, P = principal, r = rate, t = time)
distance formula d = rt
total cost total cost = (number of units) × (price per unit)
Last updated: 10/29/2014 8 Mathematics test. It will be available to test-takers during the entire Mathematics Test.