Meguel does not understand which digit is in the tenths location in the number 514.196 Where would it be located at

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

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

1. what is the measure of ∠abc? what is the measure of ∠abd?