Plane and solid geometry . cal pole 6 feet high and watched until theshadow of the pole measured exactly 6 feet. Hethen measured quickly the length of the trees shadow and called this theheight of the tree. Was his answer correct ? Draw figures and this method for measuring the height of your school building and flagpole. Ex. 769. If light from a tree,as AB^ is allowed to pass through asmall aperture 0, in a window shutterW^ and strike a white screen or wall,an inverted image of the tree, as CD^is formed on the screen. If the dis-tance 0£= 30 feet, 0F = 8 feet, andthe length of the
Plane and solid geometry . cal pole 6 feet high and watched until theshadow of the pole measured exactly 6 feet. Hethen measured quickly the length of the trees shadow and called this theheight of the tree. Was his answer correct ? Draw figures and this method for measuring the height of your school building and flagpole. Ex. 769. If light from a tree,as AB^ is allowed to pass through asmall aperture 0, in a window shutterW^ and strike a white screen or wall,an inverted image of the tree, as CD^is formed on the screen. If the dis-tance 0£= 30 feet, 0F = 8 feet, andthe length of the tree ^5=35 feet, findth3 length of the image CD. Underwhat condition will the length of the Image equal the length of the tree ?This exercise ilhistrates the principle of the photographers camera. Ex. 770. By means of Prop. XXXII construct a mean proportionalbetween two given lines. Ex. 771. In a certain circle a chord 5\/5 inches from the center is 20inches in length. Find the length of a chord U inches from the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeometr, bookyear1912
