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**Find the length of the chord |AB| in the diagram**

- A.
**3.4cm** - B.
**3.2cm** - C.
**4.2cm** - D.
**4.3cm**

**QUICK ANSWER…**

**A**

**SOLUTION****… **** **

**To resolve this, observe carefully that two sides (radius) were given, and the angle of the third side is also given. This means we are going to use cosine rule.**

**Now for the right answer to the above question:**

**Option A is correct.****Option B is incorrect.****C is incorrect.****D is not the correct answer.**

**QUICK TIPS…**

**You may please note the****se/this****:**

**There is one condition which must be satisfied before cosine rule can be applied**.**When the lengths of two sides of a triangle and the angle opposite the third [unknown] side are given, we can directly find the length of this third side by using cosine rule.****This question demonstrates this.**

**Use the questions and answer session to correct, express, and contribute your views.**

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**/culled from 2019 JAMB-UTME mathematics question 7 /**