Triangle Fundimentals

Question

Answer 1

there's 3 triangles, on the left, the right and a smaller one in the middle

the 3rd angles for the left triangle and right triangle are 68 and 47

those 2 angles are also angles of the middle triangle, which means the 3rd angle of the middle triangle = 180-68-48 = 65 degrees which also = x

180-50-62 = 180-112 = 68

180-53-80 = 180-133 = 47

180-68-47 = 180- 115 = 65 degrees = x

Answer 2

To add to what Mark M mentioned, just remember that the angle below "x" is a vertical angle relative to "x". This means the angle you calculate below "x" (the top angle in the new, smaller triangle) must also be equal to "x".

Answer 3

Measures of three angles of a triangle add to 180°

Label the size of all angles.