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3 years ago

Find the lcm of 7,18,21

Mathematics

1 answer:

Sholpan [36]3 years ago

6 0

Answer:

LCM (7, 18 and 21) = 126

Step-by-step explanation:

Step 1: Address input parameters & values

Intergers: 7 18 21

LCM (7, 18, 21) = ?

Step 2: Arrange the group of numbers in the horizontal form with space or comma separated format

7, 18 and 21

Step 3: Choose the divisor which divides each or most of the integers of in the group (7, 18 and 21), divide each integers separately and write down the quotient in the next line right under the respective integers. Bring down the integer to the next line if the integer is not divisible by the divisor. Repeat the same process until all the integers are brought to 1.

Step 4: Multiply the divisors to find the LCM 7, 18 and 21

7 × 3 × 6 = 21

LCM(7, 18, 21) = 126

The least common multiple for three numbers 7, 18, and 21 is 126

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Answer:

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2 years ago

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zmey [24]

Law of cosines :

The law of cosines establishes:

$c ^ 2 = a ^ 2 + b ^ 2 - 2*a*b*cosC.$

general guidelines:

The law of cosines is used to find the missing parts of an oblique triangle (not rectangle) when either the two-sided measurements and the included angle measure are known (SAS) or the lengths of the three sides (SSS) are known.

Law of the sines:

In ΔABC is an oblique triangle with sides a, b, and c, then:

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The law of the sines is the relation between the sides and angles of triangles not rectangles (obliques). It simply states that the ratio of the length of one side of a triangle to the sine of the angle opposite to that side is equal for all sides and angles in a given triangle.

General guidelines:

To use the law of the sines you need to know either two angles and one side of the triangle (AAS or ASA) or two sides and an opposite angle of one of them (SSA).

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If two sides and an angle opposite one of them is given, three possibilities may occur.

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(3) Exactly a triangle exists.

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