The will spend $33.60 (option C) to make the figure out of construction paper, if the construction paper cost $0.10 per square inch.
Step-by-step explanation:
The given is,
Construction paper cost $0.10 per square inch
Pyramid diagram with dimensions
Step:1
Formula to calculate the area of pyramid,
..............(1)
Where,
l - Base length
w - Base width
h - Height of pyramid
From given,
l = 12 inches
w = 12 inches
For height of pyramid,
By using Pythagorean theorem,
.................(2)
For right angle triangle,
Base =
= 6 inches
Equation (2) becomes,
![8^{2} = 6^{2} + Height^{2}](https://tex.z-dn.net/?f=8%5E%7B2%7D%20%3D%206%5E%7B2%7D%20%2B%20Height%5E%7B2%7D)
![Height^{2} = 8^{2} - 6^{2}](https://tex.z-dn.net/?f=Height%5E%7B2%7D%20%3D%208%5E%7B2%7D%20-%206%5E%7B2%7D)
![Height^{2} = 64 -36 = 28](https://tex.z-dn.net/?f=Height%5E%7B2%7D%20%3D%2064%20-36%20%3D%2028)
![Height = \sqrt{28}](https://tex.z-dn.net/?f=Height%20%3D%20%5Csqrt%7B28%7D)
Height = 5.2915 inches
h - 5.2915 inches
Equation (1) becomes,
![A = (12)(12)+(12)\sqrt{(\frac{12}{2}) ^{2} + 5.2915^{2} } +(12 )\sqrt {(\frac {12} {2}) ^{2} + 5.2915^{2} }](https://tex.z-dn.net/?f=A%20%3D%20%2812%29%2812%29%2B%2812%29%5Csqrt%7B%28%5Cfrac%7B12%7D%7B2%7D%29%20%5E%7B2%7D%20%2B%205.2915%5E%7B2%7D%20%7D%20%2B%2812%20%29%5Csqrt%20%7B%28%5Cfrac%20%7B12%7D%20%7B2%7D%29%20%5E%7B2%7D%20%2B%205.2915%5E%7B2%7D%20%7D)
![= 144+(12)\sqrt{63.999}+(12)\sqrt{63.999}](https://tex.z-dn.net/?f=%3D%20144%2B%2812%29%5Csqrt%7B63.999%7D%2B%2812%29%5Csqrt%7B63.999%7D)
![= 144+(12)(7.9999)+(12)(7.9999)](https://tex.z-dn.net/?f=%3D%20144%2B%2812%29%287.9999%29%2B%2812%29%287.9999%29)
![=144+95.999+95.999](https://tex.z-dn.net/?f=%3D144%2B95.999%2B95.999)
≅ 336 square inches
Where,
$0.10 per square inch ( from given)
Paper cost of total figure = 336 square inches
= 336 × 0.10
= $ 33.60
Result:
The will spend $33.60 to make the figure out of construction paper, if the construction paper cost $0.10 per square inch.