railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Geometry Quadrilaterals
A cyclic quadrilateral ABCD, ∠DCB = 60∘, the side length BC = 10 cm, CD = 15 cm and AD = 20 cm. DB is the diagonal to the quadrilateral ABCD. If the area of ΔDCB is 75% of the area of the ΔDAB, then find the length AB. (in cm)
1
20 cm
2
15 cm
3
7.5 cm
4
10 cm