Overview
What are perimeter, area, and volume?
The perimeter, P , of a polygon is the total length around the polygon's edges. When we add up all the side lengths of a polygon, we get its perimeter. For the figure below, the perimeter is:
P=s1+s2+s3+s4
The area, A , of a polygon is the amount of flat space inside the polygon's edges. Area is measured in square units such as square miles. Different polygons have their own area formulas.
See full list on khanacademy.org
What are perimeter, area, and volume?
The perimeter, P , of a polygon is the total length around the polygon's edges. When we add up all the side lengths of a polygon, we get its perimeter. For the figure below, the perimeter is:
P=s1+s2+s3+s4
The area, A , of a polygon is the amount of flat space inside the polygon's edges. Area is measured in square units such as square miles. Different polygons have their own area formulas.
The volume, V , of an object is the amount of space that object occupies. Volume is measured in cubic units such as cubic centimeters.
See full list on khanacademy.org
What skills are tested?
•Calculating the perimeter of a polygon
•Calculating a side length given the perimeter
•Calculating the area of a polygon
•Calculating a length given the area
•Calculating the volume of an object
•Calculating a length given the volume
See full list on khanacademy.org
Which perimeter formulas are on the test?
For a
, each side has the same length, s . The formula is:
P=4s
For a
, two sides have length l , and two sides have width w . The formula is:
P=2(l+w)
See full list on khanacademy.org
Which area formulas are on the test?
For a
, each side has the same length, s . The formula is:
A=s2
For a
, two sides have length l , and two sides have width w . The formula is:
A=lw
See full list on khanacademy.org
Which volume formulas are on the test?
For a
with length l , width w , and height h , the formula is:
V=lwh
We can also calculate one of the linear dimensions when V is given. To do so, we:
1.Write down the volume equation.
2.Plug in known values.
See full list on khanacademy.org
Your turn
TRY: CALCULATING PERIMETER
What is the perimeter of the rectangle above?
TRY: CALCULATING AREA
Triangle ABC is shown in the figure above. What is the area of triangle ABC ?
Choose 1 answer:
Choose 1 answer:
See full list on khanacademy.org
Want to join the conversation?
Log in
See full list on khanacademy.org
