nilai (a+8)° adalah

Mencari nilai a
( 3a + 15 )° + ( 2a - 10 )° = 180°
5a + 5 = 180°
5a = 175
a = 35

Maka,
( a + 8 )
= 35 + 8
= 43°
Jawaban : C

180° = 3a + 2a + 15-10
180° = 5a + 5
5a = 180 -5
a = 175/5
a = 35

Ditanyakan = ( a+ 8 )

= 35 +8
= 43