Monday

April 21, 2014

April 21, 2014

Posted by **Florence** on Monday, December 26, 2011 at 6:04am.

Please demonstrate how you reached the answer. Thanks.

- Maths -
**Reiny**, Monday, December 26, 2011 at 8:05amArea of a triangle = (1/2) (base)(height)

20 = (1/2)(x+4)(x+1)

40 = x^2 + 5x + 4

x^2 + 5x - 36 = 0

(x+9)(x-4) = 0

x = 4 or x = -9, the latter is silly in this context.

check:

if x=4, base is 8 and height is 5

what is (1/2)(8)(5) ?

**Related Questions**

math - i have trouble finding the answer to this and how to srt. there is a ...

Maths - An equilateral triangle with side length 33 is divided into 33^2 smaller...

Math - if a triangle has a perimeter of 50cm one side is double the length of ...

algebra 1 - one side of a triangle is 2cm shorter than the base The ofther side ...

maths - If the base side of a triangle is (x+4) and the height is (x+1), what is...

geometry - mrs. sally needed to build a triangular platform in the shape of an ...

GEOMETRY PLZ HELP! - Mrs.sally needed to build a triangular platform in the ...

basic geometry - mrs. sally needed to build a triangular platform in the shape ...

Math - Each equal side of an isosceles triangle is 3 1/2 inches longer than the ...

Geometry - A right triangle and a square share a side. The hypotenuse of the ...