Calculating Area: Rectangles and Triangles

Mr. Buffington introduces the concept of surface area by explaining how to calculate the area of rectangles and triangles. He demonstrates the process with examples, showing that the area of a rectangle is found by multiplying its length by its width, while the area of a triangle is half the product of its base and height. The tutorial concludes with applying these concepts to calculate the surface area of three-dimensional solids, emphasizing the importance of keeping track of each side's area.

What is the area of a rectangle with a length of 8 cm and a width of 3 cm?

• 11 square cm

• 24 square cm

• 25 square cm

• 12 square cm

If a rectangle's length is doubled and width remains the same, how does the area change?

• It doubles

• It remains the same

• It quadruples

• It halves

What is the area of a triangle with a base of 10 cm and height of 4 cm?

• 20 square cm

• 30 square cm

• 15 square cm

• 40 square cm

How do you calculate the area of a triangle?

• Divide the product of base and height by 2

• Multiply the base by the height

• Add the base and height

• None of the above

A triangle has a base of 6 cm and height of 3 cm. What is its area?

• 12 square cm

• 18 square cm

• 9 square cm

• 6 square cm

What is the surface area of a box with dimensions 2 cm by 3 cm by 4 cm?

• 52 square cm

• 48 square cm

• 36 square cm

• 24 square cm

How do you calculate the surface area of a cuboid?

• Subtract the area of the base from the total area

• None of the above

• Multiply the length by width by height

• Add the area of all faces

If one dimension of a 3D object is doubled, how does the surface area change?

• It decreases

• It doubles

• It remains the same

• It increases but not doubles

What is the surface area of a cube with side length 5 cm?

• 150 square cm

• 125 square cm

• 75 square cm

• 100 square cm

A cuboid has dimensions 2 cm, 3 cm, and 6 cm. What is the total surface area?

• 60 square cm

• 36 square cm

• 72 square cm

• 48 square cm