(Topic: Vectors) - Prove that ADE is a straight line

In the surface area formula for cylinders which expressionrepresents the lateral area

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.