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18.12.2020 •
Mathematics
a fly is sitting on a 9 meter high pool. starting from the ground, the spider climbs up 3 meters and falls 2 meter every few minutes. how many minutes will it take for the spider to catch the fly
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Ответ:
Explanation:
Given the following right triangle: (NOTE: Not to scale at all!) :
A
| \
| \
| 60 \
| \
4 | \
| \
|--- \
|_ |___ _\
C x B
Solve for "x" .
"x" = the exact length of segment "BC" .
Note: Remember the mnemonic: "SOH CAH TOA" ;
in which: "SOH : sin = opposite/ hypotenuse;
"CAH: cos = adjacent/ hypotenuse;
"TOA": tan = opposite/adjacent.
With the information we have at this point, we can use: "TOA";
that is: "tangent = opposite/ adjacent" ; to solve for "x" ;
that is: tan 60 = x / 4 ; Solve for "x" ;
↔ x / 4 = tan 60 ;
Multiply EACH SIDE of the equation by "4" ;
to isolate "x" on one side of the equation ; & to solve for "x" ;
4 * (x/4) = 4 tan 60 ;
x = 4 * tan 60 ;
x = 4* 1.732050807569 ;
x = 6.928203230276 ;
The answer choices given are:
Choice [A}: 4 units; which is incorrect; since "4 ≠ 6.928203230276" ;
Choice [B]: 4√3 units;
Choice [C]: 4√2 units;
Choice [D]: 8 units; which is incorrect; since "8 ≠ 6.928203230276" .
We are left with choices [B] and [C].
Let us try both answer choices:
Choice [B]: "4*√3" = 4 * 1.7320508075688773 = 6.9282032302755092 ;
→ which is the correct answer ;
since: "6.9282032302755092 = 6.9282032302755092" .
Choice [C]: "4*√2" = 4 * 1.414213562373095 = 5.6568542494923802 ;
This choice is INCORRECT ; since:
"5.6568542494923802 ≠ 6.9282032302755092" .
The correct answer is: [B]: " 4√3 units " .