6. Challenge problem: A surveyor due south of a building observes the top of the building to have an angle of elevation of 18. A second surveyor due east of the same building observes the top of the building to have an angle of elevation of 16. Find the height, h, of the building correct to the nearest metre if the two surveyors are 500 m apart. Additional problems can be found in Modules 3 and 4 of the Learning Materials on VUWS.