A fireman ladder is 20 cm long reaches a window 12 cm above the ground in one side of the street . Keeping the foot at the sane point ,the ladder is turned on the other side of the street to reach a window at a height of 16 cm . Find the width of the street .
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The dimensions of the cross-sectionof a girder, 2.5 m long, are shown in cm in the diagram. Find (1) the volume of the girder, (ii) the weight, if the material weighs 7.8 gm per cm.
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