Wednesday

April 16, 2014

April 16, 2014

Posted by **Anonymous** on Tuesday, December 11, 2012 at 10:18am.

- calculas -
**Steve**, Tuesday, December 11, 2012 at 10:32amget the sides of the triangle, then use Heron's formula:

PQ = √(1^2+2^2+4^2) = √21

QR = √(3^2+0^2+4^2) = 5

RP = √(2^2+2^2+0^2) = √8

I'll let you use Heron's formula. Probably better to convert to decimals rather than having all those nested roots.

- OR - calculus -
**Reiny**, Tuesday, December 11, 2012 at 11:07amarea of triange = (1/2)|vector PQ x vector PR|

vector PQ = [1,2,4] and vector PR = [-2, 2,0}

PQ X PR = [-8,-8,6]

area = (1/2)√(64+64+36) = 1/2 √164

= 1/2 (2√41) = √41

- calculus - duh -
**Steve**, Tuesday, December 11, 2012 at 11:31amgood job, Reiny. Forgot about vectors!

**Related Questions**

Calculas - A book designer decided that the pages of a book should have 1-in. ...

Calculas - A book designer decided that the pages of a book should have 1-in. ...

calculas - find the perimeter of the rectangle with maximum area that can be ...

math - int( absolute(x-1) + sqrt(9-x) ) Hint: you may interpret the integral as ...

Calculas - Can someone walk me through the following questions: Partial ...

calculas - If f(t) = square root of 7/t^5. Find f'(x) and f'(2)

math - Consider the normal curve. (Give your answers correct to four decimal ...

Calculas - Can someone please walk me through the steps for the following ...

Calculas - Find the length of the curve y=(2x), from x=1 to x=4.

Calculas - find the compute derivative of f(x)=sinh^2(5x)