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x=140°

Step-by-step explanation:

to get the exterior angle add the 2 given sides 72 and 68 to find the last interior angle

72°+68°=140°

all sums of interior angles should equal 180° so

180°-140=40°

 take 40° and subtract is by 180°

180°-40°=140°

(A flat line is 180°)

so x=140°

x = 140°

Step-by-step explanation:

All angles in a trinagle add up to 180 so to find out the missing angle, subtract 72 and 68 from 180.

180 - 72 - 68 = 40

Straight angles are equal to 180, so subtract 40 from 180.

180 - 40 = 140

x = 140°