Answer:
9) 1: 57°
2: 61°
10) 1: 43°
2: 32°
Step-by-step explanation:
9) 1: The angle is a part of a straight line and a line =180° so if you do 180-123 you get the answer (57)
2: If every angle in a triangle is added it =180° as well, so if you do 180-118 you get the second angle measurement (62) then you add both angles that you already have in the triangle (57+62=119) then you do 180-119 to get the last angle measurement, or the answer to 2 (61)
10) 1: You get the measurement of the second angle by doing 180-83 which=97 then add 40+97 which will give you 137 then subtract 180-137 which will give you the answer to #1 (43)
2: You get the measurement of the second angle by doing 180-115 which=65 then add 83+65 which will give you 146 then subtract 180-146 which will give you the answer to #2 (32)
