Mathematics, 11.10.2019 17:30 CadenClough13

Which of the following statements relating to abc is false

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The correct answer is: [C]: " cos A = $\frac{a}{c}$ " .
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Note the mnemonic device: "SOH CAH TOA" ;

in which: "sin = opposite/ hypotenuse" ;

"cos = adjacent/ hypotenuse" ;

"tan = opposite/ adjacent" .
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So, the "cos A" (that is, the "cosine" of "measure of angle, "A", should be equal the adjacent side length, "b" (in this diagram), divided by the hypotenuse length, "c" (in this diagram) .
In other words, refers to "CAH" in the mnemonic: "SOH CAH TOA" .
"cos = adjacent/ hypotenuse".

The statement in "Answer choice: [C]: " cos A = $\frac{a}{c}$ " ; is incorrect —and as such; the correct answer.
"a / c " ; that is, the "opposite divided the hypotenuse" (with respect to "Angle A") ; would be the "sin of Angle A".

The correct statement for "cos A" is "cos A = b /c " (adjacent/hypotenuse).
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Answer from: Quest

d is the answer

step-by-step explanation:

Answer from: Quest

answer:

total cost for tiles and paints is $924.

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

$\text{area of walls and ceiling}=(2*40*15)+(2*3*15)+(40*3)$

$\text{area of walls and ceiling}=1200+90+120$

$\text{area of walls and ceiling}=1410$

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

$\text{ the total painting cost}=10*(\frac{1410}{25})$

$\text{ the total painting cost}=10*56.4=564$

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

$\text{area of floor} = 40*3\text{ square meters}$

$\text{area of floor} =120\text{ square meters}$

given: 1m squared floor tiles costs $3. so,

$\text{total cost for tiles} = 3*120 = 360$

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

$\text{combined total cost}= 564+360 = 924$

therefore, the combined total cost of tiles and paint is $924.

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Which of the following statements relating to abc is false
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