Approximate the change in the lateral surface area (excluding the area of the base) of a right circular cone of fixed height of h=6 m when its radius decreases from r= 10m to r= 9.9 m

The change in the lateral surface area is approximate

Step-by-step explanation:

we know that

The lateral surface area of the cone is equal to

where

r is the radius of the base

l is the slant height

Part 1

we have

Calculate the slant height l (applying the Pythagoras Theorem)

substitute the values

Find the lateral area of the cone

Part 2

we have

Calculate the slant height l (applying the Pythagoras Theorem)

substitute the values

Find the lateral area of the cone

Part 3

Find  the change in the lateral surface area

assume

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

the answer is a if my teacher taught me correct