It is expected that students will use trigonometric ratios to solve problems involving right triangles. The ability to describe the world using direct or indirect measurement is an important skill.
Students develop trigonometric concepts through hands-on measurement activities.
Then have them measure the lengths of the opposite and adjacent sides of one angle and record the tangent ratio in tables. Then, introduce the calculator and the definition of tangent ratio , and compare students' measurements with the values shown on the calculator display. Repeat with the sine and cosine ratios. Suggest that students calculate or check the layout of the lines on a basketball court or soccer field in terms of right angles. Have students use trigonometry to measure the heights of several trees to determine the tallest totem pole they could make.