All expense accounts are known as accounts, as they close at the end of the accounting period.

All expense accounts are known as temporary accounts, as they close at the end of the accounting period.

Temporary accounts are closed at the end of an accounting period. Temporary accounts include everything that is on an income statement (revenue, expenses, gains and losses), drawing accounts, income summary accounts, and anything that directly contributes to the current year accounting. An expense account includes the expenses that a business has over the course of the period they are working in.

bd = 9 cm

step-by-step explanation:

in a 30°-60°-90° triangle, the ratio of side lengths is 1 : √3 : 2. that is, the longest side (hypotenuse) is twice the length of the shortest side.

all of the triangles in your geometry are 30°-60°-90° triangles. ac is the hypotenuse of δacd, and the short side of δabc.

the short side ad of δacd will be half the length of ac, so 3 cm. the hypotenuse ab of δabc will be twice the length of ac, so 12 cm. segment bd is the difference of the lengths ab and ad, so is

bd = ab -ad

bd = 12 cm - 3 cm = 9 cm

comment on side length ratios

you can figure the ratios of side lengths in a 30°-60°-90° triangle by considering the trig ratios of the angles. or you can figure the length of the altitude of an equilateral triangle of side length 2 using the pythagorean theorem.

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