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9) 10) 2 20+40. = 60 180-60 = 120 20° 40° 120+40+20 = 180 x = 120I was asked to find the place where there is a question mark which can also be x

9 10 2 2040 60 18060 120 20 40 1204020 180 X 120I Was Asked To Find The Place Where There Is A Question Mark Which Can Also Be X class=

Answer :

The missing side = 21°

Explanation:

The sum angles in a triangle is 180°

angles in the larger triangle:

20° + 40° + the third angle = 180°

60° + third angle = 180°

third angle = 180 - 60

third angle = 120°

When two lines cross, their opposite angles are equal. The colours in green are vertical angles. The opposite angle to the third angle we got will also be 120°

The sum of angles in the smaller triangle

120 + 39 + the missing side = 180

159 + the missing side = 180

The missing side = 180 - 159

The missing side = 21°

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