tolong dibantu dengan caranya iya

sudut pelurus = ≤A + ≤B = 180°
(7x + 8) + (5x + 4) = 180
12x + 12 = 180
12x = 180 - 12
x = 14

A = 7(12) + 8
= 92

23) < A + < B = 180°
(7x + 8 + 5x + 4)° = 180°
(12x + 12)° = 180°
(12x)° = 180° - 12°
(12x)° = 168°
x = 168° / 12°
x = 14
< A = (7x + 8)°
= (7×14 + 8)°
= (98 + 8)°
= 106° (A)
24) panjang busur CD = 90° / 120° × 60 cm
= 45 cm (C)