# Junior High School Mathematics, Book 3

Ginn, 1918 - Mathematics

### Contents

 ALGEBRA CHAPTER PAGE I INTRODUCTION 1 ADDITION AND SUBTRACTION 35 MULTIPLICATION 51 DIVISION 65 FRACTIONS 71 SIMPLE EQUATIONS 81 QUADRATIC EQUATIONS 95 GENERAL REVIEW 107
 TRIANGLES 165 PARALLEL LINES 195 PARALLELOGRAMS 205 ANGLE SUMS 221 AREAS 235 PROBLEMS OF CONSTRUCTION 257 LOCI 265 REVIEW 271

### Popular passages

Page 217 - The line joining the midpoints of two sides of a triangle is parallel to the third side and equal to one-half of it.
Page 116 - The formula states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the base and altitude.
Page 77 - To multiply a fraction by a fraction. Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
Page 279 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30| square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq. mi.) Cubic Measure 1728 cubic inches (cu. in.) =1 cubic foot (cu. ft.) 27 cubic feet = 1 cubic yard (cu.
Page 160 - Euclidean geometry, it is logically necessary that the square on the hypotenuse of a right triangle is equal to the sum of the squares on the other two sides.
Page 279 - Length 12 inches (in.) = 1 foot (ft.) 3 feet = 1 yard (yd.) 5§...
Page 116 - Euclid's, and show by construction that its truth was known to us ; to demonstrate, for example, that the angles at the base of an isosceles triangle are equal...
Page 177 - If two triangles have two angles and the included side of one equal respectively to two angles and the included side of the other, the triangles are congruent.
Page 178 - Two triangles are congruent if two angles and the included side of one are equal respectively to two angles and the included side of the other.
Page 168 - Two triangles are congruent if two sides and the included angle of one are equal respectively to two sides and the included angle of the other.