Explicación paso a paso:
9.
56 + 56 + x = 180
x = 68
10.
a + b = 180 + 90
a + b = 270
11.
47 + 2a + 69 = 180
2a = 180 - 116
2a = 64
a = 32
QSP + 47 + 32 = 180
QSP = 180 - 79 = 101
12.
5a = 90
a = 18
PSQ = 180 - 4a = 180 - 72 = 108
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Explicación paso a paso:
9.
56 + 56 + x = 180
x = 68
10.
a + b = 180 + 90
a + b = 270
11.
47 + 2a + 69 = 180
2a = 180 - 116
2a = 64
a = 32
QSP + 47 + 32 = 180
QSP = 180 - 79 = 101
12.
5a = 90
a = 18
PSQ = 180 - 4a = 180 - 72 = 108