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Multiple choice!!!!!!!!!!!!!!!!!!

Find the value of x. The diagram is not to scale.


Question 6 options:

x = 15

none of these

x = 60

x = 21

Multiple choice Find the value of x The diagram is not to scale Question 6 options x 15 none of these x 60 x 21 class=

Respuesta :

By the external angle theorem 

5x = (5x - 30) +  m < RST

m < RST  = 5x - 5x + 30  = 30

 also m < STR = m < SRT = 5x - 30

So as there are 180 degrees in a triangle:-

5x - 30 + 5x - 30 + 30 = 180

10x = 180 +30+30-30 = 210

x = 21 answer
yedida

Answer:

x = 21 i took the test

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