Question

Please help. I need this urgentlyPlease no links please​

Answer 1

Answer:

Look below

Step-by-step explanation:

(a) The area of a triangle is:

$A=\frac{1}{2}bh$

The height of this triangle is h and it's base is 4+h so...

$A=\frac{1}{2}*[h*(h+4)]$

$A=\frac{1}{2}*(h^2+4h)\\A=\frac{h^2}{2}+2h$

(b) If the height is 8 cm, then the base is 4+8 which is 12 cm so...

$A=\frac{1}{2}*8*12=4*12=48 \ cm^2$