Formula
Picture this...
What's the problem?
Can you find it?
Divide it up.
100
= BxH
area of a square
100
What is the area of the rectangle?
24km2
100
Cynthia wants to cover her room with carpet. If she has a room with a length of 14 feet and a width of 6 feet, how many square feet of carpet would she need?
84ft2
100
The area of a square with a base height of 6ft is 36ft.
What is incorrect?
Feet needs to be squared.
100
What is half of 6?
3
200
=B+W+B+W
perimeter of a square
200
What is the area of the triangle?
44mm2
200
Leah makes an origami photo frame to showcase her favorite family picture. The size of the frame is 3.5in × 8in. What is the area of the photo frame?
28in2
200
A triangle has a height of 10mm and a base of 8mm, the area is 80mm2
What is incorrect?
80 needs to be divided by 2
200
What is half of 100?
50
300
=BxH / 2
area of a triangle
300
What is the perimeter of the rectangle?
20km
300
Ms. Rodriguez wants to build a dog shed for her dog, Macy. She knows that Macy needs a bed that is 5 feet long and 4 feet wide. What is the perimeter of the dog bed she will build?
18ft
300
The perimeter of a rectangle with a base of 9in and a height of 5in is 28cm.
What is incorrect?
The label.
300
What is half of 18?
9
400
=3.14 x R x R
area of a circle
400
What is the area of the circle?
254.34cm2
400
39.6ft2
400
The radius of a circle is 5cm, so my formula should be 5 x 5 x 3.41
What is incorrect?
3.41 should be 3.14
400
What is half of 24?
12
500
Diameter / 2
radius of a circle
500
What is the area of the circle
314m2
500
Jose has a circular dartboard. The bull’s eye has a diameter of 14 mm. What is the area of the bull’s eye?
153.86 mm2
500
The diameter of a circle is 18ft, therefore the area is 200.96ft2
What is incorrect?
Half of 18 is 9 which makes the area 254.34ft2
500
What is half of 15?
7.5