Question

Can someone help me with this? I'm not sure what I'm doing wrong, there are 3 rectangles and 2 triangles, I calculated them correctly and it's still wrong, I need some help.

Answer 1

Triangular case:-

• B=9cm
• H=6cm

$\\ \bullet\sf\leadsto Area=\dfrac{1}{2}BH$

$\\ \bullet\sf\leadsto Area=\dfrac{1}{2}(6)(9)$

$\\ \bullet\sf\leadsto Area=3(9)$

$\\ \bullet\sf\leadsto Area=27cm^2$

Area of both triangular sides=27+27=54cm^2

Rectangular case;-

• L=7cm
• B=5cm

$\\ \bullet\sf\leadsto Area=LB$

$\\ \bullet\sf\leadsto Area=7(5)$

$\\ \bullet\sf\leadsto Area=35cm^2$

Area of 3sides=35(3)=105cm^2

Now

$\\ \bullet\sf\leadsto TSA=105+54=159cm^2$