You just need to substitute 4(2)-2(5)/2
8-10/2
8-5
=3

Actually Welcome to the Concept of the Surface Areas and Volumes.
Since, Volume of cone = 1/3 π r^2 h,
here, r = 10 Inches and h= 12 inches, also π =3.14
so, VOC = 1/3 π (10)^2 × (20)
VOC = 1/3(3.14)(100)(20)= 2093.33 inch^3
=> so the volume of the cone is 2093.33 cubic inches.
Answer:
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Step-by-step explanation:
(you take the first rectangle and find it's area.Area of a rectangle is l×b =5×2=10)+(the second rectangle's area l×b=2×3=6)+(the third rectangle l×b=5×2=10)all equal to 10+6+10= 26 Square units