Given trapezoid w/ top length 25, side length 18, base angle 60*, find area, perim.

[happiness]

I think I found the perimeter, Multiplying a number by a number * a square root ;for example 9*√3 by a regular number confuses me. Can you check to see if I found the perimeter right and show me how to find the area?

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[happiness]

So sorry, this is the problem.

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[Steven G]

I think I found the perimeter, Multiplying a number by a number * a square root ;for example 9*√3 by a regular number confuses me. Can you check to see if I found the perimeter right and show me how to find the area?

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The perimeter is correct. To find the area just find the area of the rectangle and the area of the triangle and add them together.

 

[Dr.Peterson]

I think I found the perimeter, Multiplying a number by a number * a square root ;for example 9*√3 by a regular number confuses me. Can you check to see if I found the perimeter right and show me how to find the area?

To multiply a radical expression like 9√3 by a number like 2, just notice that you are multiplying three numbers together: 2*9*√3. The associative property tells you that you can multiply any two of them together first: 2*(9*√3) = (2*9)*√3 = 18√3.

Your numbers are, of course, a little different, but no harder.

Then, if you take the advice to add the areas of the rectangle and triangle together, rather than just use a formula for the trapezoid, you will have to know how to add two radical expressions like 18√3 + 2√3 = 20√3. Do you know how to do that?