The height of a triangle is 4cm less than twice the length of its base, and the area is 15cm squared. find the length of the triangles base

length of the base = 5cm , height = 6cm

Step-by-step explanation:

Let the length of it's base be x , since the height of a triangle is 4cm less than twice the length of its base,

twice it's base = 2x

Therefore , the height = 2x - 4

Area = 15

The formula for finding the area of a rectangle is given as :

Area = x base x height

Therefore:

15 = x x

therefore :

factorizing , we have

which means that

 or

since the length of the base can not be negative , then , the length of the base is 5 cm

height = 2(5) - 4

height = 10 - 4

height = 6

c is the answer

step-by-step explanation: