Eric Nicholas K's answer to Skr's Secondary 3 E Maths Singapore question.
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Careful when you use the cosine rule for part 2.
The alternative method is to find angle ADC first by the sine rule before finding angle ACD by recalling that the sum of angles in a triangle is 180 degrees.
The alternative method is to find angle ADC first by the sine rule before finding angle ACD by recalling that the sum of angles in a triangle is 180 degrees.
Date Posted:
5 years ago
If sine rule is used, one obtains a value of AD = 5.4054 cm instead. Odd.
Hmmm...possibly an overload of data. In other words, the 15 degrees data is misleading.
Yup. If the sides 2cm and 5cm are assumed to be correct, then the angle 15° is off
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