TLF ID M025321
This sequence of two lessons investigates gradient and angle by applying the tangent ratio to find the angles represented by a road sign or the angle of a street. In the first lesson, students research what a road grade is and determine the actual angle of a road given its grade. They then construct their own road sign using the angle of elevation and create a sign for a ramp or slope around their school. In the second lesson students use photos and videos of 'the world's steepest street' to find the angle of elevation and tangent ratio of the street, then model the road system on a Cartesian plane. They analyse the elevation profile of the street and assess the accuracy of claims made about the street. The lessons are outlined in detail including curriculum links, vocabulary, materials needed, sample answers, discussion points and student resources. This sequence is part of the reSolve: Maths by Inquiry program.