The diagram shows a triangle.
all the measurements are in cm
the perimeter of the triangle is 70cm
the area of the triangle is acm squared
work out the value of a

A = 110.25

Step-by-step explanation:

add all the equations and equal it to 180 because all triangle angles add to 180:

4x+1 + 3x + 3x-1 = 180

10x =70

/10   /10

x = 7

Insert x into each equation and solve:

3(7)-1 = 20

4(7)-1 = 27

3(7) = 21

and then use A = 1/2 base*height formula:

A= 1/2 21* 20

A= 210

idk

step-by-step explanation:

step-by-step explanation:

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