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"How Tall is the Big Tree" Direct Proportion and Inverse Proportion PPT Courseware 2
Think about it: What is the ratio of the length of the bamboo pole to the length of the shadow measured at the same place and at the same time?
10÷12=5/6 50÷60=5/6 20÷24=5/6
Summary: The ratio of the length of the bamboo pole to the length of the shadow measured at the same place and at the same time is equal.
Discuss:
1. If the shadow length of the bamboo pole and the shadow length of the tree are not measured at the same time, will the result be correct?
2. Can you still measure the height of the building?
3. Is the height we measured accurate? Why?
Summary: At the same time and in the same place, the ratio of the measured height of an object to the length of its shadow is equal.
Object height = shadow length × ratio
Shadow length = object height ÷ ratio
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"How Tall is the Big Tree" PPT courseware of direct proportion and inverse proportion:
"How tall is the big tree" PPT courseware of direct proportion and inverse proportion. Measure and record. Place several bamboo poles of the same length upright in the sun. 1. First measure the length of the pole. 2. Then place it upright and measure the length of the shadow of each pole. At the same place, measure the same length of bamboo poles at the same time. The shadow...