Determine if each of the following is true or false. If true, explain why.
(a) ?4 + ?9 + ?13 = 180°
(b) ?5 = ?8 + ?10
(c) ?4 = ?1 + ?14
(d) ?2 + ?3 + ?4 + ?11 + ?12 + ?15 = 360°
(a) True, ?4 ? ?6 and ?6, ?9 and ?13 are the three angles of a triangle.
(b) False, ?5 is the supplement of ?8 + ?10
(c) True, ?1 + ?14 and ?4 are both supplements of ?5
(d) True, sum of all of the angles of two triangles.
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