SCIENCE WORLD This building was constructed for the Expo '86 ...
SCIENCE WORLD This building was constructed for the Expo '86 ...
SCIENCE WORLD This building was constructed for the Expo '86 ...
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2.3<br />
LESSON FOCUS<br />
Determine a height<br />
that cannot be<br />
measured directly.<br />
MATH LAB<br />
84 Chapter 2: Trigonometry<br />
Measuring an Inaccessible Height<br />
Make Connections<br />
Tree farmers use a clinometer to measure <strong>the</strong> angle between a horizontal line and<br />
<strong>the</strong> line of sight to <strong>the</strong> top of a tree. They measure <strong>the</strong> distance to <strong>the</strong> base of <strong>the</strong><br />
tree. How can <strong>the</strong>y <strong>the</strong>n use <strong>the</strong> tangent ratio to calculate <strong>the</strong> height of <strong>the</strong> tree?<br />
Construct Understanding<br />
TRY THIS<br />
Work with a partner.<br />
You will need:<br />
■ an enlarged copy of a 180° protractor<br />
■ scissors<br />
■ a measuring tape or 2 metre sticks<br />
■ a piece of heavy cardboard big enough <strong>for</strong> you to attach <strong>the</strong> paper protractor<br />
■ a drinking straw<br />
■ glue<br />
■ adhesive tape<br />
■ a needle and thread<br />
■ a small metal <strong>was</strong>her or weight<br />
■ grid paper
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