Your company relocated you from the United States to their United Kingdom office in London. You brought your personal computer with you and are in the process of setting it up. Your computer was previously configured to receive 115 VAC, but the electricity in London uses 230 VAC.

You can use your computer safely by just toggling the voltage switch on the power supply form 110 volts to 230 volts.

Explanation:

This is a similar issue to what happens with the metric system, the imperial system is used in the US as a cultural thing but it's rarely used anywhere else. The US uses 100 volts because Thomas Edison thought it would be better, while basically everyone else in the world disagrees.

Since most computers are built in China or some other Asian country, they either have an automatic voltage selector or they have a manual switch. In case the power supply uses a manual switch, all you have to do is toggle it to 230 volts.

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.

answer; closing the loop;