((5-2)*180)/5=SPT
SPT=108
360-(108+90)=RPT
RPT=162
((n-2)*180)/n=162
162n=(n-2)*180
.9n=n-2
.1n=2
n=20
Answer:
-3.53553390593
Step-by-step explanation:
5(cos165-cos105)=-3.53553390593
Volume of prism = 5 x 5 x 12 = 300 cubic centimeters
Volume of pyramid = 5 x 5 x 6 = 150 cubic centimeters
Volume of space = 300 - 150 = 150 cubic cm
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Step-by-step explanation: