luas permukaan bangun adalah

L 2 trapesium = 2 × 1/2 × [5 + (5 + \|13² - 5²)] × 5
= 2 × 1/2 × [5 + (5 + \|169 - 25)] × 5
= 2 × 1/2 × [5 + (5 + \|144)] × 5
= 2 × 1/2 × [5 + (5 + 12)] × 5
= 2 × 1/2 × (5 + 17) × 5
= 2 × 1/2 × 22 ×5
= 22 × 5
= 110 cm²

L 2 Persegi panjang = 2 × 5 × 25
= 250 cm²

L Persegi panjang (miring) = 13 × 25 = 325 cm²

L Persegi panjang (besar) = 25 × (5 + 12)
= 25 × 17
= 425cm²

L Permukaan bangun = 110cm² + 250cm² + 325cm² + 425cm² = 1.110 cm² (C.)