Page 195 - Mathematics GRADE 9, DE-STREAMED (MTH1W)

4. Have students determine how much wood is needed to construct a roof truss that looks like the image below and has a pitch of 5:12.
5. Have students cut and fold a sector of a paper circle to form a cone, as shown below.
Ask them to identify and measure the height of the cone and the radius of the circle that forms the opening of the cone. Ask them to visualize the right triangle that is formed between the height, the radius, and the slant height of the cone. Have them use the relationship of the sides of a right triangle to determine the slant height of the cone. Then ask them to measure the slant height directly using a ruler and then compare their results.
6. Have students create a composite shape that includes a right triangle, and ask them to determine its perimeter and area.
7. Have students work in small groups to design the putting green for one hole of a mini-golf course. Have them create a scale drawing of their design that includes at least one right triangle. Have them identify the key measurements needed to create their putting green and its hole and determine the scale relative to the actual measurements. Ask them to determine the total amount of surface area required for the putting green. Then have them construct the putting green using cardboard and masking tape. Once students have constructed their putting greens, set up a course outside and have students play a round of mini-golf, where they can practise their integer skills while keeping score.
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