Lesson 1.6 - Determining unknown angles in a right angle triangle. Learning Goals: By the end ef the lessen, I can determine one of the angles in a right angled triangle. \f3. Police are responding to a distress call: Police headquarters and the trouble site are shown. Squad cars and a helioopter are both immediater dispatched to the site from headquarters. 228 Sunset Boulevard 4.!) km Police Headquarters 590 Chestnut Street a] At what angle to Chestnut Street should the helicopter travel? [2 marks] [1} Assuming that the squad cars can travel at an average speed of on lrmih and the helicopter can travel twice as test, how much longer will it take torthe squad cars to reach the site than the helicopter? [2 marks] 4. An ice-cream cone has a diameter of 6 cm and a sloping edge of 15 em. Find the angle at the bottom of the cone. [2 marks] \f