Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**brittany1595****Member**- Registered: 2013-10-01
- Posts: 7

length= 7

width= 4

This rectangle just became the base of a regular prism, with a height of 6:

What is the lateral area?

What is the total surface area?

What is the volume?

What is the area of the largest rectangular side?

*Last edited by brittany1595 (2013-10-02 02:27:51)*

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,532

hi brittany1595

Stay on line for a moment and I'll have a look at these.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,532

Arrh. I see you have changed the numbers. That's better.

The lateral rectangles will be 7 by 6, 4 by 6, 7 by 6 and 4 by 6 .

So work these out and add them up.

What do you get?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**brittany1595****Member**- Registered: 2013-10-01
- Posts: 7

I just dont understand how to set up the problems... Math is my weakest subject

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,532

Would you like a diagram?

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

Offline

**brittany1595****Member**- Registered: 2013-10-01
- Posts: 7

please!

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,532

OK, here it is. (click on it to see it larger) The front is 7 by 4 and so is the back.

When you join the front to the back, that's what makes the prism.

The lateral area is the four rectangles that join the front to the back. I've shaded them red.

Can you work out the area now?

Bob

Offline

**brittany1595****Member**- Registered: 2013-10-01
- Posts: 7

Thank you! I figured them out (:

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,532

Excellent! What answer?

Bob

By the way. It's easier for me to turn the prism so the base becomes the front.

Offline

Pages: **1**