Select the correct answer.
2 answers:
You might be interested in
<span>The basis of this cone is a circle with a diameter d = 16m. This information is sufficient to calculate
1. The surface of the wheel . We use the formula
</span>
<span>
2. </span><span>the radius of the wheel needed to the formula for calculating the area of a circle and the cone
d = 16m
1/2d = r = 1/2*16m = 8m
..................................................................................................
Area base
</span>
<span>..................................................................................................
</span><span>The surface area
</span>
<span>l - creates a cone = ?
</span><span>Height , forming a cone and the radius of a circle formed triangle . Two known sides is possible to calculate the third side ( the cone ) of the Pythagorean Theorem
</span>
a = r = 8cm
b = h = 24m
c = l = ?
a² + b² = c²
r² + h² = l²
l = √ (r² + h²) = √ [ ( 8m)² + ( 24m)² ] = √ (64m² + 576m²) = √ (640 m²)= √ (8*8*10m²) = 8√10m
<span>The lateral surface of the cone
A = </span>πrl = π*8m *8√10m = 64√10πm²
The total area of the cone = <span>The base area of the side surface of +
A = 64</span>√10πm² + 64πm² = 64πm² *(√10 + 1)
1. The surface of the wheel . We use the formula
</span>
<span>
2. </span><span>the radius of the wheel needed to the formula for calculating the area of a circle and the cone
d = 16m
1/2d = r = 1/2*16m = 8m
..................................................................................................
Area base
</span>
<span>..................................................................................................
</span><span>The surface area
</span>
<span>l - creates a cone = ?
</span><span>Height , forming a cone and the radius of a circle formed triangle . Two known sides is possible to calculate the third side ( the cone ) of the Pythagorean Theorem
</span>
a = r = 8cm
b = h = 24m
c = l = ?
a² + b² = c²
r² + h² = l²
l = √ (r² + h²) = √ [ ( 8m)² + ( 24m)² ] = √ (64m² + 576m²) = √ (640 m²)= √ (8*8*10m²) = 8√10m
<span>The lateral surface of the cone
A = </span>πrl = π*8m *8√10m = 64√10πm²
The total area of the cone = <span>The base area of the side surface of +
A = 64</span>√10πm² + 64πm² = 64πm² *(√10 + 1)
Answer: 90% decrease
Step-by-step explanation: First determine whether the number is increasing or decreasing. Since it changes from 2,000 to 200, it's going down so it's decreasing.
Now to find the percent decrease, we divide the
amount of change by the original number.
The <em>amount of change</em> is the difference between the two numbers
which in this case is 2,000 - 200 and the original number is 2,000.
.
2,000 - 200 is 1,800.
So we're left with 1,800/2,000 and dividing
2,000 into 1,800 gives us 0.9.
Remember however that our problem is
asking for a <em>percent</em>, not a decimal.
So we need to write 0.9 as a percent and we can do
that by multiplying it by 100 and adding the percent sign.
So 0.9 becomes 90%.
So when a number changes from 2,000 to 200,
it has decreased by 90%.