Stránka:roll 1917.djvu/231

“'1“ "J Things to Know and Do 199 the distance between 'the peg and the tree is to the height of the tree or BA: AC:: BE:X. This may be proved by selecting lin knot on the tree which may be easily climbed to. See inside e. ' / 0" C,a/ Jig-("IL”— To Measure the Distance Across a Stream Drive a stake at H.— 1 To measure distance from H to D cut three straight poles of exactly the same length and peg them together in a triangle. Place the triangle on the bank at A, B, C, sighting the line A B for the spot at D, and put three pegs . , " ""H " "-4 Inn-p"..- " in the ground exactly under the three pegs where the triangle is. Move the triangle to E F G and placing it so that F G should line with A C, and E G with D. Now A G D "knost must be an equilateral triangle; therefore, ach‘“ to arithmetic, the line D H must be seven eighths or A G, which (an of course be easily measured.