Two triangles are shown such that one triangle is inverted and share a common vertex. The lower triangle has two angles at the base marked as 55 degrees each. The angle at the vertex of the inverted triangle at the top is marked as x degrees.
70° because the triangle must equal 180°. Therefore, 55+55=110. If the triangle must equal 180° then you subtract by the 2 angles that you have from 180°. That should get you to 180°-110° which equals 70°
