kk yg ganteng yg cantik tolong jawab donk ka aku gk bisa aku mohon jawab yg benar dengan caranya ya

Bab Bangun Datar

19. Cari dulu tingginya
t² = 17² - (12 + 3)²
t² = 289 - 225
t = √64
t = 8 cm

Luas
= 1/2 × (12 + 3 + 12 + 3) × 8
= 4 × 30
= 120 cm²

Bab Sudut

20. ∠PQR = (180 - 5x)°
∠PQR = ∠QPR
∠PQR + ∠QPR + ∠PRQ = 180°
180° - 5x° + 180° - 5x° + 50° = 180°
410° - 10x° = 180°
410° - 180° = 10x°
x = 230°/10°
x = 23