A hand book of general instruction for mechanics, containing useful rules and memoranda for practical men (1907)
Smith, Franklin Elijah, 1872- · New York, D. Van Nostrand company · leaf 209
Figs. 18. 19. 20 To Fixd the Area of a Trapezium Rule. Divide the trapezium into two triangles, byconnecting its opposite angles, making this line of divisionthe base line of both triangles. Measure the perpendicu-lar height of each triangle from this base line. Thenfind the area of each triangle,… … Fig. 21 MENSURATION 197 Thus 2)4 2 X 12 =24 sq. ft., area of triangle C2)3 1.5 X 12 = 18.0 sq. ft., area of triangle B42.0 sq. ft. Ans.Here we first of all divide the figure in two by thedotted line (A); we then have two triangles, B and C,and this line (A) proves the base for both. We thenfind the…
Mechanics · Arithmetic · Measurement
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