Answer:
Step-by-step explanation:
<h2>Cone:</h2>
diameter = 12 cm
r = 12 ÷ 2 = 6 cm
h = 6 cm
To find the surface area, we need to find the slant 'l'
= 3.14 * 6 * (6 + 8.49)
= 3.14 * 6 * 14.49
= 273 cm²
Answer:
2,25
Step-by-step explanation:
2x-4+x=5-x
2x+x+x=5+4
4x=9 |÷4
x=2,25
Answer:
The formula of the volume of a cylinder is known as follow
<h2>V= πr²h</h2>
Where
π is 3,14 or 22/7.
d (diameter) is a straight line segment that crosses a center and connects two points on the circle.
r is the radius of the to part of the cylinder.
h is the height.
we can subsitute to our formula knowing that
d = 4cm (turn to r = <em>2cm</em>,because the formula use r) ; h = 11cm
V = πr²h
= 3,14 × 2² × 11
= 3,14 × 4 × 11
= 3,14 × 44
= 138,16 rounded off (138,2cm3) result
