tolong dijawab pertanyaan nya

a. L=(20+12) x 18 dibagi 2
      =32 x 18 dibagi 2
      =288 cm²

b. L=(5+8) x 12 dibagi 2
      =13 x 12 dibagi 2
      =78 cm²

langsung aja y

rumus trapesium → ½ × (AB+CD) × t

A.
L = ½ × (12+20) ×18
L = ½ × 32 × 18
L = 16 × 18
L = 288 cm²

B.
L = ½ × (5+8) × 12
L = ½ × 13 × 12
L = 13 × 6
L = 78 cm²

C.
t = √13² - 5²
t = √169 - 25
t = √144
t = 12 cm

L = ½ × (18+5+16) × 12
L = ½ × 39 × 12
L = 39 × 6
L = 234 cm²

semoga berguna +_+