hitunglah nilai x, y, sudut spr, dan sudut qrs

a. nilai x
180° = 90° + 4x° + 5x°
180° = 90° + 9x°
180° - 90° = 9x
90° = 9x
90°/9 = x
10° = x

b. nilai y
180° = 90° + 2y° + 3y°
180° = 90° + 5y°
180° - 90° = 5y
90° = 5y
90°/5 = y
18° = y

c. besar <SPR
= 4x°
= 4 . 10°
= 40°

d. besar <QRS
= <SRP + <PRQ
= 5x° + 3y°
= 5 . 10° + 3 . 18°
= 50° + 54°
= 104°