Question

What is the surface area of a rectangular prism with width = 7cm, length = 21cm and height = 14cm?
Don't send confusing answers or I'll report it as wrong. This is 6th-grade math.

Answer 1

ans=surface area of rectangular prism= 1078 cm2

Answer 2

Question :

What is the surface area of a rectangular prism with width = 7cm, length = 21cm and height = 14cm?

Given :

• Length = 21cm.
• Width = 7cm.
• Height = 14cm.

To find :

TSA of rectangular prism.

Formula:

Since the rectangular prism in the form of cuboid, so we use the formula of TSA of cuboid.

TSA of cuboid = 2(lw + wh + hl).

Solution :

TSA of rectangular prism = 2(lw+wh+hl)

= 2(21×7 + 7×14 + 14×21)

= 2(147 + 98 + 294)

= 2( 539)

= 2 × 539

= 1078cm².

Final Answer :

TSA of rectangular prism = 1078cm².