In the given figure, measure of angle ECB is ${75}^o$.

Q. In the given figure, $\angle ABE={40}^{\circ }$ and EB bisects the angle between AB and tangent at B.CB bisects $\angle ABE.$ The measure of $\angle ECB$ is ___

Q. In the given figure, $AB=AC$ and $\angle DBC=\angle ECB={90}^{\circ }$,then $BD=CE$ .

Q. In the given figure, $AB=AC$ and $\angle DBC=\angle ECB={90}^{\circ }$, then $AD=AE$ .

Q. Two angles of a triangle are of measure ${75}^o$ and ${35}^o$. Find the measure of the third angle.

Q. A quadrilateral has three acute angles, each measuring ${75}^o$. Find the measure of the fourth angle.