# D2 - LT #2 - Layout Equipment Flashcards

Define supplementary angle

An angle that adds up to 180 degrees

Define complementary angle

An angle that adds up to 90 degrees

What is the sum of the angles in any triangles

Always 180 degrees

Which trigonometry function is used to calculate an angle when the opposite and adjacent sides of a triangle are known?

Tangent

What does the term zenith mean?

The point directly overhead of the instrument

When using a transit, what is the sum of the clockwise and counter-clockwise angles?

360 degrees

How do you rough-level a transit or theodolite equipped with an optical plummet?

Adjust the legs of the tripod

What is the difference between a transit and a theodolite?

Transit-uses vernier scale while a theodolite - all the readings are internal

What is adjusted to read the minutes and seconds when using a theodolite?

the micro-dial

In which direction can electronic theodolites lay out horizontal angles?

both clock and counter clockwise

How is a telescope transited?

Transiting a telescope is the process of flipping the telescope 180 degrees to look in the opposite direction

Why is transiting a telescope better than rotating through 180 degrees

Transiting is preferable because the zero of the horizontal scale doesn’t change

How is a baseline created?

1) Establish 2 known points

2) Known points are usually parallel to a gridline or property line. Set the instrument over p2 and zero it on P1. Transit the telescope to establish a 3rd.

Describe what SOH means

SOH

SIN = OPP / HYP

OPP = SINE X HYP

HYP = OPP / SINE

Describe what CAH means

CAH

COS = ADJ / HYP

ADJ = COS X HYP

HYP = ADJ / COD