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15 Trigonometry MEP Y9 Practice Book B - CIMT

15 Trigonometry c a b A CB 5 cm 9 cm 14 cm 6 cm X Y Z. MEP Y9 Practice Book B 149 Solution In this triangle, YZ 2 =XY XZ22+ 14 2 =XY 2 +6 2 196 =XY 2 +36 XY 2 =160 XY = 160 = 12.64911064 cm =12.6 cm (to 1 decimal place) Example 3 Determine whether or not this triangle contains a right angle. Solution