Answer:
120[tex]cm^{2}[/tex]
Step-by-step explanation:
All you need to do is find the area of 1 triangle and multiply that area by 12.
The area of a triangle is [tex]\frac{1}{2} *b*h[/tex] The b is for the base and h is for the height
Lets find the area of 1 triangle:
[tex]\frac{1}{2} *(4)*(5)[/tex] (multiply 1/2 *4)
[tex]2*5[/tex] (multiply 2*5)
[tex]10cm^{2}[/tex] (this is the area of 1 triangle)
To find the total area of all 12 triangles multiply 10 * 12
[tex]10*12 = 120cm^{2}[/tex]
