 | John Gummere - Surveying - 1814 - 398 pages
...side of which is 17.36 chains, and the adjacent angles 37° 30' and 48° 15'? Ans. 6A. 3R. 18P. PROBLE To find the area of a triangle, when the three sides are. given. % RULE; From half the sum of the three sides subtract each side severally ; multiply the half sum and... | |
 | George Alfred - Arithmetic - 1834 - 336 pages
...the perpendicular CD Э6 ; what is the area in acres, &c. ? ADS. 14 acres 2 roods 32 poks PROBLEM 7. To find the area of a triangle when the three sides are given. RULE. From half the sum of the three sides subtract each side several! y, then multiply the half sum... | |
 | Charles Davies - Geometrical drawing - 1840 - 264 pages
...triangle whose base is 72,7 yards, and altitude 36,5 yards 1 Ans. 1326,775 sq. yds. PROBLEM III. 10. To find the area of a triangle when the three sides are known. RULE. 1st. Add the three sides together and take half their sum. Mensuration of Surt'acfs. 2nd.... | |
 | Charles Davies - Geometrical drawing - 1846 - 254 pages
...triangular field whose base is 15.48 chains, and altitude 9.67 chains? Ans. 7 A. 1 R. 38 P. 27. How do you find the area of a triangle when the three sides are given? 1st. Add the three sides together and take half their sum. 2d. From this half sum take each side separately.... | |
 | Anthony Nesbit - Plane trigonometry - 1847 - 492 pages
...= 120°. ..9.93753 1 25 Log. 4.332 ....... ..0.63664 4 1.328 _40 AKP 13.120 Am. 4 1 13 PROBLEM III. To find the Area of a Triangle when the three Sides are given. From the half sum of the three sides subtract each side separately, add together the logarithms of... | |
 | P. O'Shaughnessy (Civil engineer) - Civil engineering - 1848 - 110 pages
...triangle whose three sides measure 20. 41, 24. 16, and 30. 12 chains. Ans. 24* 2r OP. Second Limma to find the area of a triangle when the three sides are given. Square the sum of any two sides, take the square of the third side from it ; take the diffc. of the... | |
 | John Ainslie - 1849 - 586 pages
...and contained angle, or two angles and adjacent side of triangles, are given to find the area. 1 . To find the area of a triangle when the three sides are given. Rule. — Add the three sides, and take half the sum. From the half sum subtract each side successively,... | |
 | Thomas Baker - Railroads - 1850 - 244 pages
...adjacent angles 60° 14' and 59° 46'; required the area by logarithms. Am. 13a. Ir. I2p. PROBLEM III. To find the area of a triangle when the three sides are given. Let a, b and c be the sides, and s their half sum, then A =: V s (s — a) (* — b) (s — c)By logarithms,... | |
 | Charles Davies - Geometry - 1850 - 218 pages
...a triangle whose base is 72,7 yards, and altitude 36,5 yards ? Ans. 1326,775 sq. yds. PROBLEM III. To find the area of a triangle when the three sides are known. RULE, I. Add" the three sides together and take half their sum. II. From this half sum take... | |
 | John Radford Young - Measurement - 1850 - 294 pages
...and Altitude being given 21 To find the Area of a Triangle when the Base and Altitude are known 22 To find the Area of a Triangle when the Three Sides are known 24 Knowing any Two Sides of a Right-angled Triangle, to find the Third Side 28 To find the Area... | |
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To find the Area of a Triangle when the Three Sides are given. Rule. — From half the sum of the three sides subtract each side separately. Multiply the half sum and the three remainders together, and extract the square root of the product. 
