What is the volume of this figure?
1 answer:
The formula for the volume of a cone is 1/3
r²h, where r is the radius and h is the height.
Insert the values into the equation:
1/3(5)²(11) ≈ 287.979327 (use a calculator for this part)
Divide 287.979327 by and convert the decimal to a fraction:
91.66666666666666666666666666666666666666... = 91 2/3
The volume of the figure is 91 2/3 cubic units or units³.
Insert the values into the equation:
1/3
Divide 287.979327 by
91.66666666666666666666666666666666666666... = 91 2/3
The volume of the figure is 91 2/3
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Answer:
Area = 370 m²
Cost to paint = £105
Step-by-step explanation:
Area of the wall of a cinema hall = Area of a trapezoid (1)+ Area of a rectangle (2) + Area of a trapezoid (3)
Area of a trapezoid =
where and
are the parallel sides and h is the distance between these sides.
Area of trapezoid (1) =
= 69 m²
Area of the rectangle (2) = Length × Width
= 12 × 15
= 180 m²
Area of the trapezoid (3) =
= 121 m²
Now area of the wall = 69 + 180 + 121
= 370 m²
One tin covers the area = 25 m²
Number of tins required to paint the wall =
=
= 14.8
Therefore, number of tins to be purchased = 15
Cost to paint the complete wall = 15 × £7
= £105
