Explanation:
we know,
angle ABD = 90° so,
Angel ABC + angle CBD = angle ABD
→ 4x + 5x = 90
→ 9x = 90
→ x = 90/9 = 10
therefore, option c 10 is correct.
hope this answer helps you dear...take care and may u have a great day ahead!
1.6m questions
2.0m answers