Question

ABCD is a rhombus. If $\angle$ACB$={40}^o$, then $\angle$ADB is __________.

• A. ${40}^o$
• B. ${45}^o$
• C. ${50}^o$
• D. ${60}^o$

Answer 1

The correct option is C ${50}^o$

from figure $\angle DAC={40}^{\circ }$

from triangle AOD;

$\angle ADO={50}^{\circ }$

$\angle ADO=\angle ADB$

$\angle ADB={50}^{\circ }$