surface area 7th grade

surface area 7th grade

notes

what were going to learn in this lesson

• understanding surface area

• being able to find surface area

• identifying surface area

what is surface area?

surface area is the total surface of a 3D figure .

key words for finding surface area

• around

• cover

• wrapped

triangular prisms

• have 5 sides

• 2 triangles

• 2 side rectangles

• 1 bottom rectangle

rectangular prisms

• have 6 sides

• 2 squares

• 1 top rectangle

• 1 bottom rectangle

• 1 front rectangle

• 1 back rectangle

formulas

• area of a triangle = lxwxh/2 OR bxh/2

• surface area of a triangular prism = find the area of all sides and add.

• area of a rectangle = lxw

• area of a rectangular prism= find the area of all sides then add

• area of a cube = lxw

• surface area of a cube = find the area of all sides and add

Multiple Choice

Find the surface area of this figure.

• 148 cm²

• 120 cm²

• 158 cm²

• 208 cm²

Multiple Choice

How do you find the AREA of a TRIANGLE?

• Length x Width divided by 2
• Length x width
• 1/3 (Length x width)
• Base x Height

Multiple Choice

What is the total surface area of the triangular prism shown? 

• 468 in²
• 540 in²
• 576 in²
• 700 in²