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Find the scaling ratio
Perimeter of first pentagon is 12*5=60 cm
Scale factor (2nd/first)=140/60 =7/3 Ratio of areas varies as the square of the scale factor for the lengths
Area of second / area of first =(7/3)^2 =49/9
Area of second pentagon =248 *(49/9) cm^2
Finish the calculation.
That depends on how simple a calculator. I'll give some examples below for calculating the cube root of 8.
On a TI-86, press 3 2nd [MATH] F5 MORE F4 8 ENTER
If the calculator has a "^" or "y^x" key, raise 8 to the 1/3 power. Again, on the TI-86, press 8 ^ ( 1 / 3 ) ENTER
If the calculator has a logarithm key, take the logarithm, divide it by three, then take the antilogarithm. Again, on the TI-86, press 2nd [e^x] ( ln 8 / 3 ) ENTER
On a slide rule, place the hairline over the number on the K scale and read the cube root on the D scale.
You might have changed the xscale and y-scale to very small values. Try resetting the calculator to defaults, or go to the window configuration and set xscale and y scale to 1 or another larger value.
Err 12 Inital load is too high power on zero point outside permissible range
Err 16 No zero point available, unable to calculate weight
Check no load on platform
Check the sensor this could be defective. This is the most likely
These scales use sensors to measure the electrical resistance of the human body to calculate body fat. If you are not stepping on the scale barefoot then that might be the reason why it is timing out. These scales require you to step on it barefoot so it can take a measurement through your feet. And using the height and gender information in combonation with the resistance measurement it can calculate your approximate body fat precentage. If you are stepping on the scale barefoot then make sure that your feet are properly placed into the sensors and avoid any movement. Let me know if you have any questions.
Here are the formulas for conversion. Let T_C be the temperature on the Celsius scale and T_F the temperature on the Fahrenheit scale. 0 _C correspond to 32 _F 100 _C correspond to 212 _F
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