Triangle ABC is an equilateral triangle. ADis perpendicular to BC.
AB=20 cm
AD bisects both angle BAC and side BC.
Find:
a. AD
b. BD
c. DC

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c