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1) https://vle.mathswatch.co.uk/images/questions/question17074.png

2) https://vle.mathswatch.co.uk/images/questions/question18036.png

 Apr 27, 2020
 #1
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2)  Since the pentagon is regular each of its interior angles is  =  (5 - 2)·180o / 5  =  108o  =  a

      To find angle(b):  it is a base angle of an isosceles triangle

               To find the third angle:  360o - 108o - 60o - 60 =  132o

                So, b  =  (180o - 132o) / 2  =  24o 

 Apr 27, 2020

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