Question

Luas permukaan segitiga ABD adalah ... (A) 54,0 cm² (B) 58,5 cm² (C) 84,0 cm² (D) 91,0 cm²​

Answer 1

Verified answer

Jawaban:

Panjang CB:

• CB = [tex] \sqrt{DB² - DC²}[/tex]
• CB = [tex] \sqrt{13² - 5²}[/tex]
• CB = [tex] \sqrt{169 - 25}[/tex]
• CB = [tex] \sqrt{144}[/tex]
• CB = 12 cm

Luas segitiga ABD:

• ABD = [tex]\frac{(AD + DC) × CB}{2}[/tex]

• ABD = [tex]\frac{(9 + 5) × 12}{2}[/tex]
• ABD = 14 × 6

• ABD = 84 cm² (C)