Practicing Success
In ΔACD, B and E are two points on side AC and AD respectively, such that BE is parallel to CD. CD=9 cm. BE = 6 cm, AB = 5 cm and ED=2cm. What are the measures of the lengths (in cm) of AE and BC? |
4, 2.5 3,4 4, 3 2.5, 4 |
4, 2.5 |
Here,BE is parallel to CD So, \(\frac{AB}{AC}\) = \(\frac{BE}{CD}\) = \(\frac{AE}{AD}\) Then, \(\frac{AB}{AC}\) = \(\frac{6}{9}\) ⇒ \(\frac{5}{5\; + \;BC}\) = \(\frac{6}{9}\) ⇒ 6BC = 45 - 30 = 15 ⇒ BC = \(\frac{15}{6}\) = 2.5 cm ⇒ Also, \(\frac{AE}{AD}\) = \(\frac{6}{9}\) ⇒ \(\frac{AE}{AE\;+\; 2}\) = \(\frac{6}{9}\) ⇒ 9AE = 6AE + 12 ⇒ 9AE - 6AE = 12 ⇒ 3AE = 12 ⇒ AE = \(\frac{12}{3}\) = 4 cm Therefore, length of AE and BC are 4cm and 2.5 cm respectively. |