tolong bantu nomor 1 dan 2 ya

1. a. 180°-(28+35)° = 117°
b. 180°-(90+50)° = 40°
2. a. 7x+3x+2x=180°
12x=180°
x=15°
b. sudut pqr = 7x = 7(15) =105°

1.

a.

B = 180 - (35 + 28)
B = 180 - 63
B = 117

b.

F = 180 - (90 + 50)
F = 180 - (140)
F = 40

2.

2x + 7x + 3x = 180
12x = 180
x = 180 / 12
x = 15

PQR = 7x
PQR = 7(15)
PQR = 105