The radii of the frustrum bases is 12
Step-by-step explanation:
In the figure attached below, ABC represents the cone cross-section while the BCDE represents frustum cross-section
As given in the figure radius and height of the cone are 9 and 12 respectively
Similarly, the height of the frustum is 4
Hence the height of the complete cone= 4+12= 16 (height of frustum+ height of cone)
We can see that ΔABC is similar to ΔADE
Using the similarity theorem
AC/AE=BC/DE
Substituting the values
12/16=9/DE
∴ DE= 16*9/12= 12
Hence the radii of the frustum is 12
10 street lights each mile x 5 miles. equals 500 street lights.
the last statement is a little bit of a trick. there is a light at point 0. there are still 10 lights needed to make it to 1 mile. if there was not a street light at the beginning. then the answer would be 501
Multiply all the numbers by what you see on the screen and the six the side and then divide it into a equal amount.
