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Mathematics

2 answers:

k0ka [10]3 years ago

8 0

Step-by-step explanation:

not sure for the answer but take how many triangles there are if they are all same same size then use this equation x÷t=a x is 360° t is how many triangles in the octagon and a is ur answer

Lemur [1.5K]3 years ago

5 0

Angle a Central angles are 22.5 degrees. 360 divided by 16

Angle b 180-(90+22.5) = 67.5 degrees

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Determine the LCm of 15 and 20

docker41 [41]

If you just want to know what is the least common multiple of 20 and 15, it is 60. Usually, this is written as lcm(20,15) = 60

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3 years ago

(a) Suppose you have 9 gold coins that look identical, but you also know one (and only one) of them is counterfeit. The counterf

alisha [4.7K]

Answer:

Step-by-step explanation:

You can split the coins into 3 groups, each of them has 3 coins. Weigh group 1 vs group 2, if one is lighter, that group has the fake coin. If both groups weigh the same, then group 3 has the fake coin.

Continue to split the group that has the fake coin into 3 groups, each group has 1 coin. Now apply the same procedure and we can identify the fake coin.

Total of scale usage is 2

b) if you have $3^n$ coins then you can apply the same approach and find the fake coin with just n steps. By splitting up to 3 groups each step, after each step you should be able to narrow down your suspected coin by 3 times.