Answer:
A. 754 cm²
Step-by-step explanation:
Amount of cardboard needed = surface area of the cone
Curved surface area of the cone = πrl
Where,
π = 3.14
r = ½(20) = 10 cm
l = 24 cm
Plug in the values into the formula
Curved surface area = 3.14 × 10 × 24 = 753.6 ≈ 754 cm²
Answer:
9 more people
Step-by-step explanation:
There are 15 first prize winners and 4 grand prize winners
that means there are 15 - 4 more first prize winners than grand prize winners
15 - 4 = 9
9 more people won first prize than the grand prize
Answer:
The sides of the equilateral triangle are 11.7 m.
Step-by-step explanation:
Let's find the area of the isosceles triangle:
Where:
b: is the base = 12 m
h: is the height
We can find the height by using Pitagoras:
Where:
x is the hypotenuse = side of the triangle = 10 m
Then, the area is:
Now, since the area of the isosceles triangle is equal to the area of the equilateral triangle:
The height of the equilateral triangle is given by:
Hence, the sides are:
Therefore, the sides of the equilateral triangle are 11.7 m.
I hope it helps you!