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" From half the sum of the three sides, subtract each side severally; multiply the half sum, and the three remainders together, and the square root of the product will be the area required. "
Principles of Architecture: Comprising Fundamental Rules of the Art, with ... - Side 92
av Peter Nicholson, Joseph Gwilt - 1848 - 280 sider
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New Elementary Geometry: With Practical Applications; a Shorter Course, Upon ...

Benjamin Greenleaf - 1873 - 176 sider
...the altitude. If the three sides are given, from half the sum of the three sides subtract each side ; multiply the half sum and the three remainders together,...square root of the product will be the area required. 1. Required the area of the triangle ABC, whose base, BC, is 210, and altitude, AD, is 190 feet. 210...
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New Elementary Geometry with Practical Applications

Benjamin Greenleaf - 1874 - 176 sider
...altitude. If the three sides are given, from, half the sum of the three sides subtract each side ; multiply the half sum and the three remainders together,...square root of the product will be the area required. 1. Required the area of the triangle ABC, whose base, BC, is 210, and altitude, AD, is 190 feet. 210...
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Mensuration for elementary and middle class schools

Henry Lewis (M.A.) - 1875 - 85 sider
...by the following rule: — From half the sum of the three sides, subtract each side separately; then multiply the half sum and the three remainders together, and the square root of the last product will be the area of the triangle. For practical purposes this rule may be more conveniently...
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The New American Arithmetic, Del 3

Samuel Mecutchen, George Mornton Sayre - 1877
...the area of a triangle. RULE. From half the sum of the three sides, subtract each side separately; multiply the half sum and the three remainders together,...square root of the product will be the area required. Note. — When the base and altitude are given, the area is equal to the base multiplied by half the...
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Arithmetic, for use in schools

John Barter (of the science and art coll, Plymouth.) - 1877
...given, to find its area. Rule. — From half the sum of the three sides subtract each side separately, multiply the half sum and the three remainders together, and the square root of the last product will be the area of the triangle. Example. — Let AB = 30, A c = 40, B c = 50. 30 + 40...
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Elements of Plane Geometry, Del 1

Thomas Hunter - 1878 - 132 sider
...sides subtract each side sepa~ rately : multiply the half sum and the three remainders continually together, and the square root of the product will be the area required.* • Demonstration.—Let AC=c, CB=<7, and AB=6; and c»—d'=AD a —DB» (e+d) (f—d)=(AD+DB) (AD—DB);...
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Explanatory Mensuration

Alfred Hiley - 1879 - 188 sider
...when the three sides are given. From half the sum of the three sides, subtract each side separately. Multiply the half sum and the three remainders together, and the square root of the product is the area. Note 1. — To find one dimension, either the base or the height, when the area of the...
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Graded Problems in Arithmetic and Mensuration

Samuel Mecutchen - 1880 - 232 sider
...find the area of a triangle. FROM half the sum of the three sides, subtract each side separately ; multiply the half sum and the three remainders together,...square root of the product will be the area required. NOTE. — When the base and altitude are given, the area is equal to the base multiplied by half the...
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Graded Problems in Arithmetic and Mensuration

Samuel Mecutchen - 1880 - 232 sider
...find the area of a triangle. FROM half the sum of the three sides, subtract each side separately ; multiply the half sum and the three remainders together,...square root of the product will be the area required. NOTE. — When the base and altitude are given, the area is equal to the base multiplied by half the...
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The engineers' manual of the Local marine examinations

Thomas Liddell Ainsley - 1880
...the following EULE LXV. From half the sum of the three sides, subtract each side separately ; then multiply the half sum and the three remainders together, and the square root of the latí product mill be the area of the triangle. For practical purposes this rule may he more conveniently...
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