Practicing Success
Δ ABC is right angles triangle with \(\angle\)B = 90°. If AB = 3\(\sqrt {3 }\)cm and \(\angle\)A = 30°, then find the value of AC - BC. |
\(\sqrt {6 }\) cm 3cm 1cm 2cm |
3cm |
tan 30° = \(\frac{Perpendicular}{Base}\) = \(\frac{BC}{AB}\) ⇒ \(\frac{1}{\sqrt {3 }}\) = \(\frac{BC}{3\sqrt {3 }}\) BC = 3cm Also; cos 30° = \(\frac{base}{hypointense}\) = \(\frac{AB}{AC}\) ⇒ \(\frac{\sqrt { 3}}{2}\) = \(\frac{3\sqrt {3 }}{AC}\) ⇒ AC = 6cm ∴ AC - BC = (6-3)cm = 3cm |