Working the
Edges
Edges
Luis has two mirrors, one is an octagon and the other is a square. Each side is 5 cm long on both mirrors. Do the mirrors have the same perimeter?
No, octagon is 40 cm, square is 20 cm?
A rectangular shape has the length of 3 units and the width of 4 units. What is the area of that shape?
A = 12 square units (or 12 u2)
Bob wants to carpet the floor of his house. It is a rectangle and the sides are 4m and 3m. How much carpet is needed?
A = 12 m2
A cube has a depth of 2 units, a length of 4 units, and a height of 3 units. Name the volume.
V =24 cubic units (or 24u3)
The distance around a figure is called _______.
Perimeter
A rectangular book has a width of 3 cm and a length of 6 cm. What is the perimeter?
P = 18cm
How do you calculate area?
What is length X width?
A juice box is 9cm wide and 5cm long. The height of the juice box is 12cm. What is the volume of the juice box?
V= 540 cm3
The number of cubic units that make up a solid figure is called _______.
Volume
A hexagon has sides that are each 7 m, what is the perimeter of the hexagon?
P = 42 m
A square room has a width of 10 m. How many square meters of flooring is needed for that room?
100 square meters (or 100m2)
Mr. Horst wants to put a fence around the playground. The sides are 100 m and 300 m and it is a rectangle. How many meters of fence will he need?
She will need 800m ?
Do two solid figures that have the same volume have to have the same shape? Give an example.
No. Example: 2x3x4 = 24u3 and 3x8x1= 243
The number of square units needed to cover a figure is called the _____.
Area
How long is each side of a triangle that has a perimeter of 27 cm?
9 cm
Length = 4m width = 7m, what is the area?
A = 28m2
The perimeter of an isosceles triangle is 50 cm. Two sides are 18 cm long. What is the length of the third side?
The side is 14 cm long.
A solid figure has the width of 4 cm, a length of 6 cm, and height of 2 cm. What is the volume of the solid figure?
48 cubic cm (48cm3)
Can a cube have a volume of 9 cubic units? Why or why not?
No. Depth, length, and height all need to be the same number of cubes
What is the length of each side of a regular pentagon with a perimeter of 30 km?
6 km
A poster shaped like an irregular quadrilateral has a base of 14cm and an area of 126cm². What is the height of the poster?
A = 9 cm2
Draw two different shapes that both have the perimeter of 16 cm. Must be different dimensions!
4cm X 4cm square, or a 6 cm X 2 cm, or 5 cm X 3cm ?
Draw a shape that has a volume of 27 cubic units.
3 x 3 x 3 cube
A square has 9 cm sides. What is the area and perimeter of the square?
A = 81 square cm (cm2) and P = 36 cm