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​Q23: Answers – Paper 3 – June 2018
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Working
ABC is a right-angled triangle. 

​a) Work out the size of angle ABC. 
Give your answer correct to 1 decimal place. 

The length of the side AB is reduced by 1 cm.

The length of the side BC is still 7 cm. 
Angle ACB is still 90

b) Will the value of cos ABC increase or decrease? 
You must give a reason for your answer. ​
Question
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23)
​ABC is a right-angled triangle. 
a) Work out the size of angle ABC.
Give your answer correct to 1 decimal place. 
[2 marks]​

The length of the side AB is reduced by 1 cm.

The length of the side BC is still 7 cm.
Angle ACB is still 90

b) Will the value of cos ABC increase or decrease?
You must give a reason for your answer. 
[1 mark]​