so all angles of a triangle are going to add up to 180°
so for L
20 + 72 + x = 180
92 + x = 180
180 - 92 = 88
For I
56 + 89 + x = 180
180 - 145 = 35
For C
28 + 128 + x = 180
180 - 156 = 24
For D
122 + 38 + x = 180
180 - 160 = 20
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