154 degrees; when you add up the two angles you get 154 subtract that from 180 which is the sum of a triangle. You should get 26 for the third angle of the triangle. when you extend the segment if MH you form an X the acute angle of the X are 26 to find H you subtract 26 from 180 since a straight line is 180 and you get 154 for the abtuse angles which is also H