Homework Help: math

Posted by mota on Friday, November 9, 2007 at 2:45pm.

i have a question in math
(( distance between two points ))

the vertices of a right triangle are S(-2,-2), T(10,-2), and R(4,5). find the area of the triangle.

please in detales .. thank u

math - Reiny, Friday, November 9, 2007 at 5:13pm
first of all, your triangle is not right-angled.
The slopes are 7/6, -7/6 and zero
None of these are negative reciprocals of each other, a condition for a right angle.

But the area is easy to find
Clearly the base ST = 12 units and the height from R to ST is 7

So the area = 1/2 x 12 x 7
= 42 units^2
math - mota, Saturday, November 10, 2007 at 2:21am
thank u
math - mota, Saturday, November 10, 2007 at 2:49am
can u explain how u get the height ?

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