18(a)Sine Cosine RulesEasy1 markIn this question, all lengths are in centimetres.Show that the area of triangle ABC is 21x2cm2.AnswerTypeWriteMath0 wordsGrade answerSolutionGrading criteria
18(b)Quadratic Equations InequalitiesMedium3 marksThe area of triangle ABC is equal to the area of triangle DEF.Show that x2−14x+24=0.AnswerTypeWriteMath0 wordsGrade answerSolutionGrading criteria
18(c)Quadratic Equations InequalitiesMedium4 marksBy factorising and solving x2−14x+24=0, find the area of triangle ABC.Factorised formAreacm2Grade answerSolutionGrading criteria