On December 31, the company estimates future sales refunds to be $900. As of that date, the company has an unadjusted debit balance in Accounts Receivable of $25,000 and an unadjusted credit balance of $300 in Sales Refunds Payable. Requried:
Write down the necessary adjusting entry.

Date      Account titles and Explanation       Debit    Credit

Dec 31   Sales return and allowance               $600

                     Sales refund payable                                $600

                     ($900 - $300)

              (To record the expected refund of sales)

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.